{"id":46254,"date":"2023-06-02T15:29:30","date_gmt":"2023-06-02T06:29:30","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=46254&#038;post_type=knowledgebase&#038;preview_id=46254"},"modified":"2026-03-07T00:49:29","modified_gmt":"2026-03-06T15:49:29","slug":"the-authenticity-of-host-cant-be-established","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/the-authenticity-of-host-cant-be-established\/","title":{"rendered":"\u30108\u3064\u306e\u65b9\u6cd5\u3011\u300cAuthenticity of Host Can\u2019t Be Established\u300d\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f"},"content":{"rendered":"<p>\u300cAuthenticity of Host Can\u2019t Be Established\uff08\u30db\u30b9\u30c8\u306e\u4fe1\u983c\u6027\u304c\u78ba\u7acb\u3067\u304d\u307e\u305b\u3093\uff09\u300d\u30a8\u30e9\u30fc\u306f\u3001\u901a\u5e38<a href=\"https:\/\/kinsta.com\/jp\/blog\/how-to-use-ssh\/\">SSH\uff08\u30bb\u30ad\u30e5\u30a2\u30b7\u30a7\u30eb\uff09<\/a>\u3067\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3059\u308b\u969b\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u7b2c\u4e09\u8005\u304c\u30b5\u30fc\u30d0\u30fcID\u3092\u60aa\u7528\u3057\u3066\u3044\u308b\u306a\u3069\u3001\u6df1\u523b\u306a\u554f\u984c\u3092\u793a\u5506\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5e78\u3044\u3001\u3053\u306e\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3057\u3066\u3001\u5b89\u5168\u304b\u3064\u30b9\u30e0\u30fc\u30ba\u306a\u63a5\u7d9a\u3092\u78ba\u4fdd\u3059\u308b\u65b9\u6cd5\u306f\u8907\u6570\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u81ea\u5df1\u8a8d\u8a3c\u5c40\uff08CA\uff09\u3092\u4f5c\u6210\u3057\u305f\u308a\u3001SSH\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u66f4\u65b0\u3057\u305f\u308a\u3001\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306e\u78ba\u8a8d\u3057\u305f\u308a\u306a\u3069\u3002<\/p>\n<p>\u4eca\u56de\u306f\u3001\u3053\u306e\u300cAuthenticity of Host Can\u2019t Be Established\u300d\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066\u6398\u308a\u4e0b\u3052\u3001\u767a\u751f\u539f\u56e0\u30688\u3064\u306e\u89e3\u6c7a\u7b56\u3092\u3054\u7d39\u4ecb\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc><\/p>\n<h2>\u300cAuthenticity of Host Can&#8217;t Be Established\u300d\u30a8\u30e9\u30fc\u3068\u306f<\/h2>\n<p>\u300cAuthenticity of Host Can\u2019t Be Established\u300d\u30a8\u30e9\u30fc\u306f\u3001SSH\uff08\u30bb\u30ad\u30e5\u30a2\u30b7\u30a7\u30eb\uff09\u4f7f\u7528\u6642\u306b\u767a\u751f\u3059\u308b\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3067\u3059\u3002SSH\u63a5\u7d9a\u306b\u306f\u3001\u901a\u5e38\u30d1\u30b9\u30ef\u30fc\u30c9\u306b\u3088\u308b\u8a8d\u8a3c\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u516c\u958b\u9375\u3092\u4f7f\u3063\u3066\u8a8d\u8a3c\u3092\u884c\u3046\u3053\u3068\u3082\u53ef\u80fd\u3067\u3001\u305d\u306e\u5834\u5408\u306b\u306f\u516c\u958b\u9375\u3068\u79d8\u5bc6\u9375\u304b\u3089\u306a\u308bSSH\u30ad\u30fc\u30da\u30a2\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u79d8\u5bc6\u9375\u306f\u81ea\u5206\u306e\u30b7\u30b9\u30c6\u30e0\u4e0a\u306b\u6b8b\u308a\u3001\u516c\u958b\u9375\u306f\u63a5\u7d9a\u5148\u306e\u30b7\u30b9\u30c6\u30e0\u306b\u30b3\u30d4\u30fc\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306fSSH\u3067\u30b5\u30fc\u30d0\u30fc\u306b\u521d\u3081\u3066\u63a5\u7d9a\u3059\u308b\u969b\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001SSH\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u305d\u306e\u30b5\u30fc\u30d0\u30fc\u3092\u307e\u3060\u7406\u89e3\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u4fe1\u983c\u3067\u304d\u308b\u30b5\u30fc\u30d0\u30fc\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u3063\u3066\u3044\u308c\u3070\u3001\u305d\u306e\u307e\u307e\u30a8\u30e9\u30fc\u3092\u89e3\u9664\u3057\u3066\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001SSH\u9375\u304c<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u683c\u7d0d\u3055\u308c\u3001\u6b21\u56de\u4ee5\u964d\u306e\u63a5\u7d9a\u6642\u306b\u306f\u3001\u30db\u30b9\u30c8\u304b\u3089\u53d6\u5f97\u3057\u305f\u9375\u3068<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u9375\u3092\u7167\u3089\u3057\u5408\u308f\u305b\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u8eab\u5143\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u524d\u306b\u63a5\u7d9a\u3057\u305f\u3053\u3068\u306e\u3042\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3057\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u901a\u5e38\u30b5\u30fc\u30d0\u30fc\u304c\u5225\u306e\u9375\u3067\u518d\u8a2d\u5b9a\u3055\u308c\u305f\u3053\u3068\u3092\u793a\u5506\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u6df1\u523b\u306a\u554f\u984c\u304c\u751f\u3058\u3066\u3044\u308b\u53ef\u80fd\u6027\u3082\u3042\u308b\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4f55\u8005\u304b\u304c\u30b5\u30fc\u30d0\u30fc\u306e\u8eab\u5143\u3092\u507d\u308a\u3001\u63a5\u7d9a\u3092\u4ecb\u3057\u3066\u9001\u4fe1\u3055\u308c\u308b\u30c7\u30fc\u30bf\u3092\u508d\u53d7\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u4e3b\u306a\u539f\u56e0\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>\u300cAuthenticity of Host Can&#8217;t Be Established\u300d\u30a8\u30e9\u30fc\u306e\u539f\u56e0<\/h2>\n<p>\u300cAuthenticity of Host Can\u2019t Be Established\u300d\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u306f\u3055\u307e\u3056\u307e\u3002\u4ee5\u4e0b\u3001\u7279\u306b\u4e00\u822c\u7684\u306a\u3082\u306e\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306e\u516c\u958b\u9375\u304c\u5909\u66f4\u3055\u308c\u305f<\/strong>\uff1a\u3053\u308c\u306f\u901a\u5e38\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u66f4\u65b0\u3055\u308c\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u304c\u3001\u60aa\u610f\u3042\u308b\u30e6\u30fc\u30b6\u30fc\u304c\u306a\u308a\u3059\u307e\u3057\u3092\u884c\u3044\u3001\u30db\u30b9\u30c8\u304c\u4fb5\u5bb3\u3055\u308c\u3066\u3044\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u521d\u3081\u3066\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306b\u63a5\u7d9a\u3059\u308b<\/strong>\uff1aSSH\u304c\u30b5\u30fc\u30d0\u30fc\u3092\u8a8d\u8b58\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u539f\u56e0\u3067\u3001\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u8907\u6570\u306e\u30db\u30b9\u30c8\u516c\u958b\u9375\u304c\u3042\u308b<\/strong>\uff1a\u30b5\u30fc\u30d0\u30fc\u306f\u3001ECDSA\u3084RSA\u306a\u3069\u306e\u8907\u6570\u306e\u516c\u958b\u9375\u6697\u53f7\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7570\u306a\u308b\u516c\u958b\u9375\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3068\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30db\u30b9\u30c8\u306e\u516c\u958b\u9375\u304c\u524a\u9664\u3055\u308c\u305f\u307e\u305f\u306f\u7834\u640d\u3057\u3066\u3044\u308b<\/strong>\uff1aSSHException\u304c\u767a\u751f\u3057\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306eDNS\u8a2d\u5b9a\u306b\u8aa4\u308a\u304c\u3042\u308b<\/strong>\uff1a<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-dns\/\">\u30c9\u30e1\u30a4\u30f3\u30cd\u30fc\u30e0\u30b7\u30b9\u30c6\u30e0\uff08DNS\uff09<\/a>\u306e\u8a2d\u5b9a\u306b\u8aa4\u308a\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u4e0d\u6b63\u306a\u516c\u958b\u9375\u3092\u6301\u3064\u30db\u30b9\u30c8\u306b\u63a5\u7d9a\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u4e2d\u9593\u8005\uff08MITM\uff09\u653b\u6483<\/strong>\uff1a\u653b\u6483\u8005\u304c\u81ea\u5206\uff08\u30ed\u30fc\u30ab\u30eb\u30db\u30b9\u30c8\uff09\u3068\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u9593\u306e\u63a5\u7d9a\u3092\u508d\u53d7\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u5506\u3057\u3066\u3044\u308b\u3053\u3068\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3088\u308a\u826f\u3044\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u306f\u3001\u8cea\u306e\u9ad8\u3044\u30b5\u30fc\u30d0\u30fc\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<a href=\"https:\/\/sevalla.com\/application-hosting\/\">Kinsta\u306e\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b5\u30fc\u30d0\u30fc<\/a>\u3067\u306f\u3001\u9ad8\u6027\u80fd\u30a4\u30f3\u30d5\u30e9\u4e0a\u3067\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001Kinsta\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306f\u3001Cloudflare\u306e\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30ec\u30d9\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a5f\u80fd\u3092\u642d\u8f09\u3002\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3084<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-a-ddos-attack\/\">DDoS\u5bfe\u7b56<\/a>\u306a\u3069\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001SSL\u8a3c\u660e\u66f8\u3082\u7121\u6599\u3067\u4f7f\u7528\u3067\u304d\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u72ec\u81eaSSEL\u8a3c\u660e\u66f8\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3082\u53ef\u80fd\u3067\u3059\u3002\u4f7f\u7528\u3057\u305f\u5206\u3060\u3051\u652f\u6255\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u4fa1\u683c\u8a2d\u5b9a\u3067\u3001\u30d3\u30b8\u30cd\u30b9\u306e\u6210\u9577\u306b\u5408\u308f\u305b\u3066\u30ea\u30bd\u30fc\u30b9\u3092\u7c21\u5358\u306b\u62e1\u5f35\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h2>\u300cAuthenticity of Host Can&#8217;t Be Established\u300d\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f\uff088\u3064\u306e\u65b9\u6cd5\uff09<\/h2>\n<p>\u300cAuthenticity of Host Can\u2019t Be Established\u300d\u30a8\u30e9\u30fc\u306e\u6982\u8981\u3092\u62bc\u3055\u3048\u305f\u3068\u3053\u308d\u3067\u3001\u65e9\u901f\u305d\u306e\u89e3\u6c7a\u7b56\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>1. \u63a5\u7d9a\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n<p>\u307e\u305a\u6700\u521d\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u306e\u5b89\u5b9a\u6027\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3002\u307e\u305f\u3001\u63a5\u7d9a\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b\u3082\u306e\u304c\u306a\u3044\u304b\u3082\u8abf\u67fb\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/wordpress-security-plugins\/\">\u30a6\u30a4\u30eb\u30b9\u5bfe\u7b56\u30bd\u30d5\u30c8<\/a>\u3084<a href=\"https:\/\/kinsta.com\/jp\/blog\/sucuri-firewall\/\">\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\uff08WAF\uff09<\/a>\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u63a5\u7d9a\u306e\u59a8\u3052\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4e00\u6642\u7684\u306b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u7121\u52b9\u306b\u3057\u3066\u3001\u30a8\u30e9\u30fc\u304c\u6d88\u3048\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<h3>2. IP\u30a2\u30c9\u30ec\u30b9\u3092\u7f6e\u304d\u63db\u3048\u308b<\/h3>\n<p>\u4e00\u822c\u7684\u306b\u3001\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306f1\u3064\u306e\u516c\u958b\u9375\u3057\u304b\u6301\u3063\u3066\u3044\u306a\u3044\u3068\u601d\u308f\u308c\u304c\u3061\u3067\u3059\u304c\u3001\u3053\u308c\u306f\u9593\u9055\u3044\u3067\u3001\u8907\u6570\u306e\u516c\u958b\u9375\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001RSA\u9375\u3092\u4f7f\u7528\u3057\u3066\u3044\u3066\u3082\u3001\u30b5\u30fc\u30d0\u30fc\u304cECDSA\u9375\u3092\u63d0\u793a\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u516c\u958b\u9375\u304c\u7570\u306a\u308b\u5834\u5408\u3082\u3001\u30a8\u30e9\u30fc\u306e\u767a\u751f\u539f\u56e0\u306b\u3002HostKeyAlgorithms\u3092\u8a2d\u5b9a\u3057\u305f\u5834\u5408\u306b\u306f\u3001SSH\u3067\u6307\u5b9a\u3055\u308c\u305f\u8a2d\u5b9a\u304c\u512a\u5148\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong>~\/.ssh\/config<\/strong>\u30d5\u30a1\u30a4\u30eb\u3068<strong>\/etc\/ssh\/ssh_config<\/strong>\u30d5\u30a1\u30a4\u30eb\u3067\u3001\u3053\u306e\u8a2d\u5b9a\u304c\u884c\u308f\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u3001<strong>~\/.ssh\/config<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u3092\u8cbc\u308a\u4ed8\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><code># Update with the real IP address. Host 192.0.2.1 HostKeyAlgorithms rsa-sha2-512,rsa-sha2-256,ssh-rsa<\/code><\/p>\n<p>\u3053\u308c\u306b\u3088\u3063\u3066\u3001SHA-1\u7f72\u540d\u306e\u4f7f\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001SHA-1\u7f72\u540d\u306f\u8106\u5f31\u6027\u304c\u5ea6\u3005\u691c\u51fa\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u5b89\u5168\u3068\u306f\u8a00\u3048\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u30b5\u30fc\u30d0\u30fc\u304cSHA-2\u7f72\u540d\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u3001\u3053\u306e\u30b3\u30de\u30f3\u30c9\u3092\u524a\u9664\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u307e\u305f\u3001\u30b7\u30b9\u30c6\u30e0\u304c\u30cf\u30c3\u30b7\u30e5\u5316\u3055\u308c\u305f\u30a8\u30f3\u30c8\u30ea\u3092\u4f7f\u7528\u3057\u306a\u3044\u5834\u5408\u3082\u3042\u308a\u3001\u8ffd\u52a0\u3057\u305f\u9375\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5834\u5408\u306f\u3001\u540c\u3058\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3067<strong>HashKnownHosts<\/strong>\u3092\u78ba\u8a8d\u3057\u3001\u305d\u308c\u306b\u5fdc\u3058\u3066\u8abf\u6574\u3092\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001\u300cssh-keygen -F 192.0.2.1 -l\u300d\u3067IP\u30a2\u30c9\u30ec\u30b9\u3092\u7f6e\u304d\u63db\u3048\u3066\u3001\u4e00\u81f4\u3059\u308b\u3082\u306e\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>3. \u30db\u30b9\u30c8\u9375\u306e\u78ba\u8a8d\u3092\u56de\u907f\u3059\u308b<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u7121\u5bb3\u3067\u3042\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6700\u8fd1\u30b5\u30fc\u30d0\u30fc\u306e\u66f4\u65b0\u3084\u518d\u8a2d\u5b9a\u304c\u884c\u308f\u308c\u3001\u305d\u308c\u306b\u5fdc\u3058\u3066\u30db\u30b9\u30c8\u516c\u958b\u9375\u304c\u5358\u306b\u5909\u66f4\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u7279\u306b\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u5834\u5408\u3001null\u306e<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u9375\u3092\u9001\u308b\u3053\u3068\u3067\u3001\u8a8d\u8a3c\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u8cbc\u308a\u4ed8\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><code>$ ssh -o \"UserKnownHostsFile=\/dev\/null\" -o \"StrictHostKeyChecking=no\" user@host<\/code><\/p>\n<p>\u307e\u305f\u3001<strong>~\/.ssh\/config<\/strong>\u3067\u7279\u5b9a\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u3066\u6052\u4e45\u7684\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\uff08\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u3066\u8a2d\u5b9a\u3059\u308b\u5834\u5408\u306f\u3001<strong>\/etc\/ssh\/ssh_config<\/strong>\uff09\u3002<\/p>\n<h3>4. \u81ea\u5df1\u8a8d\u8a3c\u5c40\uff08CA\uff09\u3092\u4f5c\u6210\u3059\u308b<\/h3>\n<p>\u30a6\u30a7\u30d6\u30d6\u30e9\u30a6\u30b6\u306b\u306f\u3001X509\u8a3c\u660e\u66f8\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u521d\u3081\u3066\u8a2a\u554f\u3059\u308b\u30b5\u30a4\u30c8\u306e<a href=\"https:\/\/kinsta.com\/jp\/blog\/free-ssl-certificate\/\">SSL\uff08\u30bb\u30ad\u30e5\u30a2\u30bd\u30b1\u30c3\u30c4\u30ec\u30a4\u30e4\u30fc\uff09\u8a3c\u660e\u66f8<\/a>\u3092\u4fe1\u983c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/ssh-vs-ssl\/\">SSH\u30af\u30e9\u30a4\u30a2\u30f3\u30c8<\/a>\u306e\u4e2d\u306b\u306f\u3001X509\u3084PKI\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u3082\u306e\u3082\u3002\u305d\u306e\u5834\u5408\u3001\u30d9\u30ea\u30b5\u30a4\u30f3\u306eSSL\u8a3c\u660e\u66f8\u3067\u8a8d\u8a3c\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u81ea\u5df1\u8a8d\u8a3c\u5c40\uff08CA\uff09\u3092\u4f5c\u6210\u3057\u3066\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3067\u304d\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u81ea\u5df1\u8a8d\u8a3c\u5c40\u306b\u3088\u3063\u3066\u3001\u30b5\u30fc\u30d0\u30fc\u306b\u30ed\u30b0\u30a4\u30f3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u516c\u958b\u9375\u3092\u6301\u3064\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3001\u81ea\u52d5\u7684\u306b\u305d\u306e\u30b5\u30fc\u30d0\u30fc\u3092\u4fe1\u983c\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u306f\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/generate-ssh-key\/\">SSH\u30ad\u30fc\u30da\u30a2\u3092\u751f\u6210<\/a>\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><code>ssh-keygen -f cert_signer<\/code><\/p>\n<p>\u5404\u30b5\u30fc\u30d0\u30fc\u306e\u30db\u30b9\u30c8\u516c\u958b\u9375\u306b\u4ee5\u4e0b\u306e\u7f72\u540d\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<p><code>ssh-keygen -s cert_signer -I cert_signer -h -n www.example.com -V +52w \/etc\/ssh\/ssh_host_rsa_key.pub<\/code><\/p>\n<p>\u3053\u308c\u3067\u3001\u7f72\u540d\u4ed8\u304d\u306e\u30db\u30b9\u30c8\u516c\u958b\u9375\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><code>\/etc\/ssh\/ssh_host_rsa_key-cert.pub<\/code><\/p>\n<p>\u6b21\u306b\u3001<strong>\/etc\/ssh\/sshd_config<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u79fb\u52d5\u3057\u3001HostCertificate\u3092<strong>HostCertificate \/etc\/ssh\/ssh_host_rsa_key-cert.pub<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u7d10\u4ed8\u3051\u307e\u3059\u3002<\/p>\n<p>SSH\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u518d\u8d77\u52d5\u3057\u3001<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u8cbc\u308a\u4ed8\u3051\u307e\u3059\u3002<\/p>\n<p><code>@cert-authority *.example.com ssh-rsa AAAAB3Nz...cYwy+1Y2u\/<\/code><\/p>\n<p>\u4e0a\u8a18\u30b3\u30fc\u30c9\u306b\u306f\u3001\u4ee5\u4e0b\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u8a8d\u8a3c\u5c40<\/li>\n<li>\u30c9\u30e1\u30a4\u30f3\uff08example.com\uff09<\/li>\n<li>\u516c\u958b\u9375\u306e\u5185\u5bb9<\/li>\n<\/ul>\n<p>cert_signer\u306e\u516c\u958b\u9375\u306f\u3001cert_signer\u306e\u79d8\u5bc6\u9375\u306b\u3088\u3063\u3066\u7f72\u540d\u3055\u308c\u305f\u30db\u30b9\u30c8\u516c\u958b\u9375\u3092\u6301\u3064\u30b5\u30fc\u30d0\u30fc\u3092\u4fe1\u983c\u3059\u308b\u305f\u3081\u3001\u3053\u308c\u3067\u30a8\u30e9\u30fc\u304c\u89e3\u6d88\u3055\u308c\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<h3>5. SSH\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u66f4\u65b0\u3059\u308b<\/h3>\n<p>SSH\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u66f4\u65b0\u3057\u3001\u6700\u65b0\u306e\u72b6\u614b\u306b\u3059\u308b\u3053\u3068\u3082\u89e3\u6c7a\u7b56\u306b\u306a\u308a\u5f97\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u3068\u306e\u4e92\u63db\u6027\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u66f4\u65b0\u306b\u306f\u3001\u63a5\u7d9a\u306e\u5b89\u5b9a\u6027\u3084\u5b89\u5168\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u30d0\u30b0\u4fee\u6b63\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d1\u30c3\u30c1\u304c\u542b\u307e\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u305f\u3081\u3001\u66f4\u65b0\u5f8c\u3001\u30a8\u30e9\u30fc\u304c\u89e3\u6d88\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>6. \u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n<p>\u30db\u30b9\u30c8\u9375\u304c\u6b63\u3057\u304f\u306a\u3044\u3001\u307e\u305f\u306f\u6709\u52b9\u671f\u9650\u304c\u5207\u308c\u3066\u3044\u308b\u5834\u5408\u3082\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306e\u9375\u304c\u9069\u5207\u306b\u751f\u6210\u3055\u308c\u3001\u6709\u52b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u52a0\u3048\u3066\u3001\u30ea\u30e2\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u304c\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u63a5\u7d9a\u53ef\u80fd\u306a\u72b6\u614b\u3067\u3042\u308b\u3053\u3068\u3001\u305d\u3057\u3066\u5bfe\u8c61\u306e\u30b5\u30fc\u30d0\u30fc\u3092\u88c5\u3063\u305f\u60aa\u610f\u306e\u3042\u308b\u30b5\u30fc\u30d0\u30fc\u3067\u306f\u306a\u304f\u3001\u6b63\u3057\u3044\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3057\u3066\u3044\u308b\u304b\u3082\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305a\u306f\u3001\u300cssh-keyscan\u300d\u30b3\u30de\u30f3\u30c9\u3067\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p><code>ssh-keyscan example.com<\/code><\/p>\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u3067\u3001\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306e\u516c\u958b\u9375\u304c\u53d6\u5f97\u3055\u308c\u3001\u7aef\u672b\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b<a href=\"https:\/\/www.positioniseverything.net\/the-provided-key-element-does-not-match-the-schema\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u9375<\/a>\uff08\u307e\u305f\u306f\u30b5\u30fc\u30d0\u30fc\u7ba1\u7406\u8005\u304b\u3089\u63d0\u4f9b\u3055\u308c\u305f\u9375\uff09\u3068\u7167\u3089\u3057\u5408\u308f\u305b\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e00\u81f4\u3059\u308b\u5834\u5408\u3001\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306f\u6b63\u3057\u3044\u30b5\u30fc\u30d0\u30fc\u3067\u3042\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u3067\u3059\u3002\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u7ba1\u7406\u8005\u306b\u554f\u984c\u3092\u5831\u544a\u3057\u3001\u63a5\u7d9a\u3092\u505c\u6b62\u3059\u308b\u306e\u304c\u6700\u5584\u306e\u7b56\u3067\u3059\u3002<\/p>\n<h3>7. \u53e4\u3044\u30db\u30b9\u30c8\u9375\u3092\u524a\u9664\u3059\u308b<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u30db\u30b9\u30c8\u9375\u304c\u5909\u66f4\u3055\u308c\u305f\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u3053\u3068\u3082\u3042\u308b\u305f\u3081\u3001<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u53e4\u3044\u9375\u3092\u524a\u9664\u3057\u3066\u89e3\u6c7a\u3059\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306e\u9375\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u8a2d\u5b9a\u306e\u5909\u66f4\u3084<a href=\"https:\/\/kinsta.com\/jp\/blog\/wordpress-hacked\/\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4fb5\u5bb3<\/a>\u306b\u3088\u3063\u3066\u66f4\u65b0\u3055\u308c\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3053\u306e\u5834\u5408\u306f\u3001\u53e4\u3044\u30db\u30b9\u30c8\u9375\u304c\u65b0\u3057\u3044\u3082\u306e\u3068\u4e00\u81f4\u305b\u305a\u306b\u3001\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002<\/p>\n<p><strong>known_hosts<\/strong>\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30ea\u30e2\u30fc\u30c8\u30db\u30b9\u30c8\u306e\u516c\u958b\u9375\u3092\u524a\u9664\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p><code>ssh-keygen -R example.com<\/code><\/p>\n<p>\u3053\u308c\u3067\u3001<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u9375\u304c\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u6b21\u306bSSH\u3067\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3059\u308b\u969b\u306b\u306f\u3001\u65b0\u305f\u306a\u30db\u30b9\u30c8\u9375\u306e\u8a8d\u8a3c\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>8. DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u30af\u30ea\u30a2\u3059\u308b<\/h3>\n<p>\u30b5\u30fc\u30d0\u30fc\u306eDNS\uff08\u30c9\u30e1\u30a4\u30f3\u30cd\u30fc\u30e0\u30b7\u30b9\u30c6\u30e0\uff09\u8a2d\u5b9a\u304c\u8aa4\u3063\u3066\u3044\u308b\u3053\u3068\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u8aa4\u3063\u305f\u9375\u3067\u63a5\u7d9a\u3055\u308c\u3001\u30a8\u30e9\u30fc\u306b\u3064\u306a\u304c\u3063\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u308c\u3092\u89e3\u6c7a\u3059\u308b\u6700\u3082\u7c21\u5358\u306a\u65b9\u6cd5\u306f\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/flush-dns\/\">DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u30af\u30ea\u30a2<\/a>\u3059\u308b\u3053\u3068\u3002\u691c\u7d22\u30d0\u30fc\u306b\u300ccmd\u300d\u3068\u5165\u529b\u3057\u3066\u3001Windows\u306e\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\u3092\u958b\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<figure style=\"width: 1109px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/05\/command-prompt.png\" alt=\"Windows\u306e\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\" width=\"1109\" height=\"625\"><figcaption class=\"wp-caption-text\">Windows\u306e\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8<\/figcaption><\/figure>\n<p>\u6b21\u306b\u3001\u4ee5\u4e0b\u306e<a href=\"https:\/\/kinsta.com\/blog\/ssh-commands\/\">SSH\u30b3\u30de\u30f3\u30c9<\/a>\u3092\u8cbc\u308a\u4ed8\u3051\u307e\u3059\u3002<\/p>\n<p><code>ipconfig\/flushdns<\/code><\/p>\n<p>\u3053\u308c\u3067\u30a8\u30e9\u30fc\u304c\u89e3\u6d88\u3055\u308c\u3001\u554f\u984c\u306a\u304f\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u300cAuthenticity of Host Can\u2019t Be Established\u300d\u30a8\u30e9\u30fc\u306f\u3001\u901a\u5e38SSH\u3067\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3057\u3088\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u3067\u518d\u8a2d\u5b9a\u304c\u884c\u308f\u308c\u305f\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u4e00\u65b9\u3067\u3001\u91cd\u8981\u306a\u554f\u984c\u3092\u793a\u5506\u3057\u3066\u3044\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u521d\u56de\u63a5\u7d9a\u6642\u306b\u3053\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u308b\u306e\u306f\u6b63\u5e38\u3067\u3059\u3002\u7121\u8996\u3057\u3066\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u3001\u30db\u30b9\u30c8\u3092\u78ba\u8a8d\u3057\u3001\u6b63\u3057\u3044\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002\u72b6\u6cc1\u306b\u3088\u3063\u3066\u306f\u3001<strong>known_hosts<\/strong>\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u53e4\u3044\u30db\u30b9\u30c8\u9375\u3092\u524a\u9664\u3057\u305f\u308a\u3001SSH\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306e\u66f4\u65b0\u304c\u5fc5\u8981\u306b\u306a\u3063\u305f\u308a\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u9ad8\u3081\u308b\u7c21\u5358\u306a\u65b9\u6cd5\u306f\u3001<a href=\"https:\/\/kinsta.com\/jp\/\">Kinsta<\/a>\u306e\u3088\u3046\u306a\u512a\u308c\u305f\u30b5\u30fc\u30d0\u30fc\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3002Kinsta\u306e\u3059\u3079\u3066\u306e\u30d7\u30e9\u30f3\u306b\u306f\u3001\u3042\u3089\u3086\u308b\u554f\u984c\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u652f\u63f4\u3059\u308b\u3001\u30c8\u30c3\u30d7\u30af\u30e9\u30b9\u306e\u30b5\u30dd\u30fc\u30c8\u3092\u3054\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u300cAuthenticity of Host Can\u2019 &#8230;<\/p>\n","protected":false},"author":199,"featured_media":46255,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[804],"class_list":["post-46254","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-security-tips"],"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>\u30108\u3064\u306e\u65b9\u6cd5\u3011\u300cAuthenticity of Host Can\u2019t Be Established\u300d\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f\uff5cKinsta\u00ae<\/title>\n<meta name=\"description\" content=\"\u300cAuthenticity of Host Can\u2019t Be 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