{"id":23397,"date":"2019-06-26T03:21:15","date_gmt":"2019-06-26T10:21:15","guid":{"rendered":"https:\/\/kinsta.com\/?post_type=knowledgebase&#038;p=44928"},"modified":"2025-10-02T04:52:29","modified_gmt":"2025-10-01T19:52:29","slug":"error-521","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/error-521\/","title":{"rendered":"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066"},"content":{"rendered":"<p>521\u30a8\u30e9\u30fc\u306f\u3001WordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u304cCloudflare\u3068\u306e\u63a5\u7d9a\u3092\u62d2\u5426\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u308bCloudflare\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u4e0b\u8a18\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><a href=\"#what\">521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u6982\u8981<\/a><\/li>\n<li><a href=\"#cause\">521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u539f\u56e0<\/a><\/li>\n<li><a href=\"#fix\">521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u51e6\u7406<\/a><\/li>\n<\/ul>\n<h2><a id=\"what\"><\/a>521\u300c\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u304c\u30c0\u30a6\u30f3\u3057\u3066\u3044\u307e\u3059\u300d\u3068\u306f\uff1f<\/h2>\n<p>\u524d\u8ff0\u306e\u3088\u3046\u306b\u3001521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002<\/p>\n<p>\u7c21\u5358\u306b\u3044\u3046\u3068\u3001\u30a6\u30a7\u30d6\u30d6\u30e9\u30a6\u30b6\u304cCloudflare\u306b\u6b63\u5e38\u306b\u63a5\u7d9a\u3067\u304d\u307e\u3057\u305f\u304c\u3001Cloudflare\u306f\u30aa\u30ea\u30b8\u30f3\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\uff08WordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc\u30d0\uff09\u306b\u63a5\u7d9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p>\u5177\u4f53\u7684\u306b\u306f\u3001Cloudflare\u306fWordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3057\u3088\u3046\u3068\u3057\u307e\u3057\u305f\u304c\u3001\u300c<strong>\u63a5\u7d9a\u62d2\u5426\u30a8\u30e9\u30fc<\/strong>\u300d\u304c\u8fd4\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>Cloudflare\u306f\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u63a5\u7d9a\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u8a2a\u554f\u8005\u306b\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306b521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<figure style=\"width: 1439px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/05\/error-521-cloudflare-wordpress-1.png\" alt=\"A521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u4f8b\" width=\"1439\" height=\"874\"><figcaption class=\"wp-caption-text\">521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u4f8b<\/figcaption><\/figure>\n<h3><a id=\"cause\"><\/a> 521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u539f\u56e0\u306f\uff1f<\/h3>\n<p>521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u8003\u3048\u3089\u308c\u308b\u539f\u56e0\u306f2\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u4e00\u3064\u76ee\u306fWordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u30c0\u30a6\u30f3\u3057\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002\u3059\u3079\u3066\u306e\u8a2d\u5b9a\u304c\u6b63\u3057\u304f\u3066\u3082\u3001WordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u30aa\u30d5\u30e9\u30a4\u30f3\u3067\u3042\u308c\u3070\u3001Cloudflare\u306f\u63a5\u7d9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u4e8c\u3064\u76ee\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u306f\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u3066\u3044\u308b\u304c\u3001\u4f55\u3089\u304b\u306e\u7406\u7531\u3067Cloudflare\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002Cloudflare\u306e\u57fa\u672c\u6a5f\u80fd\u306e\u305b\u3044\u3067\u8aa4\u3063\u3066Cloudflare\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Cloudflare\u306f\u30ea\u30d0\u30fc\u30b9\u30d7\u30ed\u30ad\u30b7\u3067\u3042\u308b\u305f\u3081\u3001\u30aa\u30ea\u30b8\u30f3\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306f\u3001\u500b\u3005\u306e\u8a2a\u554f\u8005\u306e\u56fa\u6709\u306eIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u306e\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u5c11\u6570\u306eCloudflare\u306eIP\u304b\u3089\u306e\u3082\u306e\u306e\u3088\u3046\u306b\u898b\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u9650\u3089\u308c\u305f\u6570\u306eIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u306e\u5927\u91cf\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u653b\u6483\u3068\u898b\u306a\u3057\u3066\u30d6\u30ed\u30c3\u30af\u3059\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305b\u3044\u3067Cloudflare\u306f\u63a5\u7d9a\u3067\u304d\u305a\u3001521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2><a id=\"fix\"><\/a>Cloudflare\u3068WordPress\u306e521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u51e6\u7406\u306b\u3064\u3044\u3066<\/h2>\n<p>\u3055\u3066\u3001WordPress\u306e521\u30a8\u30e9\u30fc\u306e\u6982\u8981\u3092\u7406\u89e3\u3057\u305f\u70ba\u3001\u51e6\u7406\u306b\u5165\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30c6\u30c3\u30d71\uff1a\u30aa\u30ea\u30b8\u30f3\u30b5\u30fc\u30d0\u30fc\u304c\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u3042\u308b\u3092\u30c6\u30b9\u30c8\u3059\u308b<\/h3>\n<p>\u5148\u306b\u9032\u3080\u524d\u306b\u3001WordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u6b63\u5e38\u306b\u6a5f\u80fd\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u308c\u4ee5\u4e0a\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u624b\u9806\u3092\u8abf\u3079\u3066\u3082\u610f\u5473\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u308c\u3092\u30c6\u30b9\u30c8\u3059\u308b\u306b\u306f\u3001cURL\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002Mac\u307e\u305f\u306fLinux\u3092\u3054\u5229\u7528\u306e\u65b9\u306f\u3001\u30bf\u30fc\u30df\u30ca\u30eb\u304b\u3089\u76f4\u63a5\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Windows\u306b\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306fcURL\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304c\u3001<a href=\"https:\/\/tools.keycdn.com\/curl\" target=\"_blank\" rel=\"noopener noreferrer\">KeyCDN\u306e\u30aa\u30f3\u30e9\u30a4\u30f3HTTP\u30d8\u30c3\u30c0\u30fc\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb<\/a>\u3092\u4f7f\u7528\u3057\u305f\u65b9\u304c\u3057\u3084\u3059\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p><strong>http:\/\/1.2.3.4<\/strong>\u3092\u8a18\u5165\u3059\u308b\u3060\u3051\u3067\u3059\u3002\uff081.2.3.4\u3092\u30b5\u30fc\u30d0\u30fc\u306e\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002\uff09<\/p>\n<figure style=\"width: 1691px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/05\/error-521-cloudflare-wordpress-2.png\" alt=\"KeyCDN\u306e\u30d8\u30c3\u30c0\u30fc\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb\" width=\"1691\" height=\"940\"><figcaption class=\"wp-caption-text\">KeyCDN\u306e\u30d8\u30c3\u30c0\u30fc\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb<\/figcaption><\/figure>\n<p>Kinsta\u306e\u304a\u5ba2\u69d8\u306b\u300c<strong>\u30b5\u30a4\u30c8<\/strong>\u300d\u30bf\u30d6\u3067\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u78ba\u8a8d\u3044\u305f\u3060\u3051\u307e\u3059\uff1a<\/p>\n<figure id=\"attachment_30822\" aria-describedby=\"caption-attachment-30822\" style=\"width: 2352px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-30822 size-full\" src=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/mykinsta_find_ip_address0.png\" alt=\"Kinsta\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u5834\u6240\" width=\"2352\" height=\"1212\" srcset=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/mykinsta_find_ip_address0.png 2352w, https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/mykinsta_find_ip_address0-300x155.png 300w, https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/mykinsta_find_ip_address0-1024x528.png 1024w, https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/mykinsta_find_ip_address0-768x396.png 768w, https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/mykinsta_find_ip_address0-1536x792.png 1536w, https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/mykinsta_find_ip_address0-2048x1055.png 2048w\" sizes=\"auto, (max-width: 2352px) 100vw, 2352px\" \/><figcaption id=\"caption-attachment-30822\" class=\"wp-caption-text\">Kinsta\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u5834\u6240<\/figcaption><\/figure>\n<p>\u307e\u305f\u306f\u3001Cloudflare\u306e\u30a6\u30a7\u30d6\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u306e\u300c<strong>DNS<\/strong>\u300d\u306b\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u306e\u300c<strong>A<\/strong>\u30ec\u30b3\u30fc\u30c9\u300d\u304b\u3089\u53d6\u5f97\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30fc\u30d0\u30fc\u304c\u8d77\u52d5\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001<strong>HTTP 200<\/strong>\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002Kinsta\u306e\u304a\u5ba2\u69d8\u306a\u3089\u3001\u300c<strong>404 Not Found<\/strong>\u300d\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3082\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u304c\u8d77\u52d5\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\uff08\u305d\u306eIP\u306e\u30da\u30fc\u30b8\u306f\u5b58\u5728\u3057\u306a\u3044\u3060\u3051\u3067\u3059\u3002\uff09<\/p>\n<figure style=\"width: 1756px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/05\/error-521-cloudflare-wordpress-4.png\" alt=\"\u6210\u529f\u3057\u305f\u63a5\u7d9a\u306e\u4f8b\" width=\"1756\" height=\"558\"><figcaption class=\"wp-caption-text\">\u6210\u529f\u3057\u305f\u63a5\u7d9a\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u7570\u5e38\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u300c<strong>\u30db\u30b9\u30c8\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093<\/strong>\u300d\u307e\u305f\u306f\u300c<strong>\u63a5\u7d9a\u306b\u5931\u6557\u3057\u307e\u3057\u305f<\/strong>\u300d\u306a\u3069\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<figure style=\"width: 1589px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/05\/error-521-cloudflare-wordpress-5.png\" alt=\"\u30b5\u30fc\u30d0\u30fc\u7570\u5e38\u306e\u4f8b\" width=\"1589\" height=\"368\"><figcaption class=\"wp-caption-text\">\u30b5\u30fc\u30d0\u30fc\u7570\u5e38\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u30b5\u30fc\u30d0\u30fc\u7570\u5e38\u306e\u7591\u3044\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u3054\u5229\u7528\u306e\u30b5\u30fc\u30d0\u30fc\u4f1a\u793e\u306e\u30b5\u30dd\u30fc\u30c8\u30c1\u30fc\u30e0\u306b\u9023\u7d61\u3057\u3066\u304f\u3060\u3055\u3044\u3002\uff08Kinsta\u306e\u304a\u5ba2\u69d8\u306b\u306f\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u306eIntercom\u30a6\u30a3\u30b8\u30a7\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u3066<a href=\"https:\/\/kinsta.com\/jp\/docs\/support\/contact-support\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u30b5\u30dd\u30fc\u30c8\u30c1\u30fc\u30e0\u306b\u9023\u7d61<\/a>\u3044\u305f\u3060\u3051\u307e\u3059\u3002\uff09<\/p>\n<h3>\u30b9\u30c6\u30c3\u30d72\uff1a\u30b5\u30fc\u30d0\u30fc\u306e\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3067Cloudflare\u306e\u3059\u3079\u3066\u306eIP\u7bc4\u56f2\u3092\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u5316\u3059\u308b<\/h3>\n<p>WordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u6b63\u5e38\u306b\u6a5f\u80fd\u3057\u3066\u3044\u3066\u3082\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u304d\u306b521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u306e\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u3001Cloudflare\u306e\u3059\u3079\u3066\u306eIP\u7bc4\u56f2\u3092\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306b\u767b\u9332\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/www.cloudflare.com\/ips\/\" target=\"_blank\" rel=\"noopener noreferrer\">Cloudflare\u306e\u3059\u3079\u3066\u306eIP\u7bc4\u56f2\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002<\/a><\/p>\n<p><a href=\"https:\/\/kinsta.com\/jp\/blog\/wordpress-htaccess-file\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>.htaccess<\/strong><\/a>\u3001<strong>iptables<\/strong>\u307e\u305f\u306f\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3067\u3053\u308c\u3089\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u30b5\u30fc\u30d0\u30fc\u4f1a\u793e\u304cCloudflare\u306eIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u306eIP\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u30ec\u30fc\u30c8\u5236\u9650\u3057\u305f\u308a\u30d6\u30ed\u30c3\u30af\u3057\u305f\u308a\u3057\u306a\u3044\u3053\u3068\u3082\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3084\u308a\u65b9\u304c\u308f\u304b\u3089\u306a\u3044\u65b9\u306f\u3001\u3054\u5229\u7528\u306e\u30b5\u30fc\u30d0\u30fc\u4f1a\u793e\u306e\u30b5\u30dd\u30fc\u30c8\u30c1\u30fc\u30e0\u306b\u9023\u7d61\u3057\u3066\u304f\u3060\u3055\u3044\u3002Kinsta\u3067\u306f\u3001\u3053\u308c\u3089\u306eIP\u7bc4\u56f2\u306f\u3059\u3067\u306b\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30c6\u30c3\u30d73\uff1a\u7279\u5225\u306a\u624b\u6bb5\u3092\u691c\u8a0e\u3059\u308b<\/h3>\n<p>\u6700\u5f8c\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u8a2d\u5b9a\u306b\u5fdc\u3058\u305f\u5177\u4f53\u7684\u306a\u6280\u8853\u7684\u624b\u9806\u3092\u3044\u304f\u3064\u304b\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p><strong>1\uff09<\/strong>Cloudflare\u306eHTTPS\u3092\u4f7f\u7528\u3057\u59cb\u3081\u305f\u3070\u304b\u308a\u306e\u5834\u5408\u3001\u30aa\u30ea\u30b8\u30f3\u30b5\u30fc\u30d0\u30fc\u304cCloudflare\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u30dd\u30fc\u30c8443\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u8a31\u53ef\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u8a31\u53ef\u3059\u308b\u3088\u3046\u306b\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3092\u8a2d\u5b9a\u3067\u304d\u306a\u3044\u65b9\u306f\u3001Cloudflare\u3067\u300c<strong>Full SSL<\/strong>\u300d\u3067\u306f\u306a\u304f\u300c<strong>Flexible SSL<\/strong>\u300d\u3092\u4f7f\u7528\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><strong>2\uff09<\/strong>\u8a72\u5f53\u3059\u308b\u5834\u5408\u306f\u3001<strong>Bad Behavior<\/strong>\u307e\u305f\u306f<strong>mod_security<\/strong>\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u6700\u65b0\u7248\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><strong>3\uff09<\/strong><strong>mod_antiloris<\/strong>\u307e\u305f\u306f<strong>mod_reqtimeout<\/strong>\u306eApache\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u3054\u5229\u7528\u306e\u65b9\u306f\u3001\u305d\u308c\u3089\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u7121\u52b9\u306b\u3057\u3066\u30a2\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>Kinsta\u306e\u304a\u5ba2\u69d8\u3067\u3001\u4e0a\u8a18\u306e\u8abf\u6574\u3092\u5b9f\u65bd\u3057\u305f\u3066\u3082521\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u65b9\u306f\u3001Kinsta\u306e\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u306eIntercom\u30c1\u30e3\u30c3\u30c8\u30a6\u30a3\u30b8\u30a7\u30c3\u30c8\u3067\u5f53\u793e\u306e\u30b5\u30dd\u30fc\u30c8\u30c1\u30fc\u30e0\u307e\u3067\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002\u5bfe\u5fdc\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>521\u30a8\u30e9\u30fc\u306f\u3001WordPress\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30b5\u30fc &#8230;<\/p>\n","protected":false},"author":103,"featured_media":23403,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[78,36],"topic":[757,830],"class_list":["post-23397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-cloudflare","tag-wordpress","topic-cloudflare","topic-wordpress-issues"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066<\/title>\n<meta name=\"description\" content=\"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kinsta.com\/jp\/blog\/error-521\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\" \/>\n<meta property=\"og:description\" content=\"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinsta.com\/jp\/blog\/error-521\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/\" \/>\n<meta property=\"article:published_time\" content=\"2019-06-26T10:21:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-01T19:52:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1460\" \/>\n\t<meta property=\"og:image:height\" content=\"730\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Matteo Du\u00f2\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png\" \/>\n<meta name=\"twitter:creator\" content=\"@matteoduo\" \/>\n<meta name=\"twitter:site\" content=\"@Kinsta_JP\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"Matteo Du\u00f2\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/\"},\"author\":{\"name\":\"Matteo Du\u00f2\",\"@id\":\"https:\/\/kinsta.com\/jp\/#\/schema\/person\/9d811e805493f00205e6409451055174\"},\"headline\":\"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\",\"datePublished\":\"2019-06-26T10:21:15+00:00\",\"dateModified\":\"2025-10-01T19:52:29+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/\"},\"wordCount\":120,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/kinsta.com\/jp\/#organization\"},\"image\":{\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png\",\"keywords\":[\"cloudflare\",\"WordPress\"],\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/\",\"url\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/\",\"name\":\"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\",\"isPartOf\":{\"@id\":\"https:\/\/kinsta.com\/jp\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png\",\"datePublished\":\"2019-06-26T10:21:15+00:00\",\"dateModified\":\"2025-10-01T19:52:29+00:00\",\"description\":\"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002\",\"breadcrumb\":{\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/kinsta.com\/jp\/blog\/error-521\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage\",\"url\":\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png\",\"contentUrl\":\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png\",\"width\":1460,\"height\":730},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/error-521\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/kinsta.com\/jp\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Cloudflare\",\"item\":\"https:\/\/kinsta.com\/jp\/topics\/cloudflare\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/kinsta.com\/jp\/#website\",\"url\":\"https:\/\/kinsta.com\/jp\/\",\"name\":\"Kinsta\u00ae\",\"description\":\"\u9ad8\u901f\u304b\u3064\u5805\u7262\u306a\u30d7\u30ec\u30df\u30a2\u30e0\u30b5\u30fc\u30d0\u30fc\u30b5\u30fc\u30d3\u30b9\",\"publisher\":{\"@id\":\"https:\/\/kinsta.com\/jp\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/kinsta.com\/jp\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ja\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/kinsta.com\/jp\/#organization\",\"name\":\"Kinsta\",\"url\":\"https:\/\/kinsta.com\/jp\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/kinsta.com\/jp\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/12\/kinsta-logo.jpeg\",\"contentUrl\":\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/12\/kinsta-logo.jpeg\",\"width\":500,\"height\":500,\"caption\":\"Kinsta\"},\"image\":{\"@id\":\"https:\/\/kinsta.com\/jp\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/\",\"https:\/\/x.com\/Kinsta_JP\",\"https:\/\/www.instagram.com\/kinstahosting\/\",\"https:\/\/www.linkedin.com\/company\/kinsta\/\",\"https:\/\/www.pinterest.com\/kinstahosting\/\",\"https:\/\/www.youtube.com\/c\/Kinsta\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/kinsta.com\/jp\/#\/schema\/person\/9d811e805493f00205e6409451055174\",\"name\":\"Matteo Du\u00f2\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/kinsta.com\/jp\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/78636e34d9c125b93efb7e0893a776f8?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/78636e34d9c125b93efb7e0893a776f8?s=96&d=mm&r=g\",\"caption\":\"Matteo Du\u00f2\"},\"description\":\"Head of Content at Kinsta and Content Marketing Consultant for WordPress plugin developers. Connect with Matteo on Twitter.\",\"sameAs\":[\"https:\/\/www.matteoduo.com\",\"https:\/\/www.linkedin.com\/in\/matteoduo\/\",\"https:\/\/x.com\/matteoduo\"],\"url\":\"https:\/\/kinsta.com\/jp\/blog\/author\/matteoduo\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066","description":"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kinsta.com\/jp\/blog\/error-521\/","og_locale":"ja_JP","og_type":"article","og_title":"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066","og_description":"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002","og_url":"https:\/\/kinsta.com\/jp\/blog\/error-521\/","og_site_name":"Kinsta\u00ae","article_publisher":"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/","article_published_time":"2019-06-26T10:21:15+00:00","article_modified_time":"2025-10-01T19:52:29+00:00","og_image":[{"width":1460,"height":730,"url":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png","type":"image\/png"}],"author":"Matteo Du\u00f2","twitter_card":"summary_large_image","twitter_description":"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002","twitter_image":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png","twitter_creator":"@matteoduo","twitter_site":"@Kinsta_JP","twitter_misc":{"\u57f7\u7b46\u8005":"Matteo Du\u00f2","\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593":"2\u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/#article","isPartOf":{"@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/"},"author":{"name":"Matteo Du\u00f2","@id":"https:\/\/kinsta.com\/jp\/#\/schema\/person\/9d811e805493f00205e6409451055174"},"headline":"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066","datePublished":"2019-06-26T10:21:15+00:00","dateModified":"2025-10-01T19:52:29+00:00","mainEntityOfPage":{"@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/"},"wordCount":120,"commentCount":1,"publisher":{"@id":"https:\/\/kinsta.com\/jp\/#organization"},"image":{"@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage"},"thumbnailUrl":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png","keywords":["cloudflare","WordPress"],"inLanguage":"ja","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/kinsta.com\/jp\/blog\/error-521\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/","url":"https:\/\/kinsta.com\/jp\/blog\/error-521\/","name":"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066","isPartOf":{"@id":"https:\/\/kinsta.com\/jp\/#website"},"primaryImageOfPage":{"@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage"},"image":{"@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage"},"thumbnailUrl":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png","datePublished":"2019-06-26T10:21:15+00:00","dateModified":"2025-10-01T19:52:29+00:00","description":"521\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fCloudflare\u306b\u7279\u6709\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u672c\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002","breadcrumb":{"@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/#breadcrumb"},"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/kinsta.com\/jp\/blog\/error-521\/"]}]},{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/#primaryimage","url":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png","contentUrl":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2019\/06\/521-error-wordpress-cloudflare.png","width":1460,"height":730},{"@type":"BreadcrumbList","@id":"https:\/\/kinsta.com\/jp\/blog\/error-521\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/kinsta.com\/jp\/"},{"@type":"ListItem","position":2,"name":"Cloudflare","item":"https:\/\/kinsta.com\/jp\/topics\/cloudflare\/"},{"@type":"ListItem","position":3,"name":"WordPress\u3068Cloudflare\u306e521\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066"}]},{"@type":"WebSite","@id":"https:\/\/kinsta.com\/jp\/#website","url":"https:\/\/kinsta.com\/jp\/","name":"Kinsta\u00ae","description":"\u9ad8\u901f\u304b\u3064\u5805\u7262\u306a\u30d7\u30ec\u30df\u30a2\u30e0\u30b5\u30fc\u30d0\u30fc\u30b5\u30fc\u30d3\u30b9","publisher":{"@id":"https:\/\/kinsta.com\/jp\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/kinsta.com\/jp\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"ja"},{"@type":"Organization","@id":"https:\/\/kinsta.com\/jp\/#organization","name":"Kinsta","url":"https:\/\/kinsta.com\/jp\/","logo":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/kinsta.com\/jp\/#\/schema\/logo\/image\/","url":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/12\/kinsta-logo.jpeg","contentUrl":"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/12\/kinsta-logo.jpeg","width":500,"height":500,"caption":"Kinsta"},"image":{"@id":"https:\/\/kinsta.com\/jp\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/","https:\/\/x.com\/Kinsta_JP","https:\/\/www.instagram.com\/kinstahosting\/","https:\/\/www.linkedin.com\/company\/kinsta\/","https:\/\/www.pinterest.com\/kinstahosting\/","https:\/\/www.youtube.com\/c\/Kinsta"]},{"@type":"Person","@id":"https:\/\/kinsta.com\/jp\/#\/schema\/person\/9d811e805493f00205e6409451055174","name":"Matteo Du\u00f2","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/kinsta.com\/jp\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/78636e34d9c125b93efb7e0893a776f8?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/78636e34d9c125b93efb7e0893a776f8?s=96&d=mm&r=g","caption":"Matteo Du\u00f2"},"description":"Head of Content at Kinsta and Content Marketing Consultant for WordPress plugin developers. Connect with Matteo on Twitter.","sameAs":["https:\/\/www.matteoduo.com","https:\/\/www.linkedin.com\/in\/matteoduo\/","https:\/\/x.com\/matteoduo"],"url":"https:\/\/kinsta.com\/jp\/blog\/author\/matteoduo\/"}]}},"acf":[],"_links":{"self":[{"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/posts\/23397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/users\/103"}],"replies":[{"embeddable":true,"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/comments?post=23397"}],"version-history":[{"count":6,"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/posts\/23397\/revisions"}],"predecessor-version":[{"id":30824,"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/posts\/23397\/revisions\/30824"}],"alternate":[{"embeddable":true,"hreflang":"en","title":"English","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/en"},{"embeddable":true,"hreflang":"it","title":"Italian","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/it"},{"embeddable":true,"hreflang":"fr","title":"French","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/fr"},{"embeddable":true,"hreflang":"ja","title":"Japanese","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/jp"},{"embeddable":true,"hreflang":"es","title":"Spanish","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/es"},{"embeddable":true,"hreflang":"pt","title":"Portuguese","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/pt"},{"embeddable":true,"hreflang":"de","title":"German","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/de"},{"embeddable":true,"hreflang":"da","title":"Danish","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/dk"},{"embeddable":true,"hreflang":"nl","title":"Dutch","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/nl"},{"embeddable":true,"hreflang":"sv","title":"Swedish","href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/translations\/se"},{"href":"https:\/\/kinsta.com\/jp\/wp-json\/kinsta\/v1\/posts\/23397\/tree"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/media\/23403"}],"wp:attachment":[{"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/media?parent=23397"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/tags?post=23397"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/kinsta.com\/jp\/wp-json\/wp\/v2\/topic?post=23397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}