{"id":32793,"date":"2019-08-15T09:04:27","date_gmt":"2019-08-15T16:04:27","guid":{"rendered":"https:\/\/kinsta.com\/?post_type=knowledgebase&#038;p=44928"},"modified":"2025-10-01T20:06:55","modified_gmt":"2025-10-01T19:06:55","slug":"error-521","status":"publish","type":"post","link":"https:\/\/kinsta.com\/dk\/blog\/error-521\/","title":{"rendered":"S\u00e5dan rettes 521 Error med WordPress og Cloudflare"},"content":{"rendered":"<p>Error 521 er en Cloudflare-specifik fejlmeddelelse, der vises, n\u00e5r dit WordPress-websteds server afviser en forbindelse med Cloudflare.<\/p>\n<p>I dette indl\u00e6g l\u00e6rer du:<\/p>\n<ul>\n<li><a href=\"#what\">Mere om, hvad Error 521-meddelelsen er<\/a><\/li>\n<li><a href=\"#cause\">Hvad der for\u00e5rsager meddelelsen Error 521<\/a><\/li>\n<li><a href=\"#fix\">S\u00e5dan rettes Error 521 til Cloudflare og WordPress<\/a><\/li>\n<\/ul>\n<h2><a id=\"what\"><\/a>Hvad er Error 521 Webserver er nede?<\/h2>\n<p>Som du l\u00e6rte ovenfor, er Error 521-meddelelsen en fejlmeddelelse, der er specifik for Cloudflare.<\/p>\n<p>I bund og grund betyder det, at din webbrowser var i stand til at oprette forbindelse til Cloudflare, men Cloudflare var ikke i stand til at oprette forbindelse til oprindelseswebserveren &#8211; Ogs\u00e5 kendt som dit WordPress-websteds server.<\/p>\n<p>Specifikt fors\u00f8gte Cloudflare at oprette forbindelse til dit WordPress-websteds server, men modtog en <strong>forbindelse n\u00e6gtet<\/strong> fejl som svar.<\/p>\n<p>Da Cloudflare ikke kan oprette forbindelse til dit websted, er det ikke i stand til at vise dit websted for bes\u00f8gende og viser i stedet fejlmeddelelsen Error 521:<\/p>\n<figure style=\"width: 1439px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/dk\/wp-content\/uploads\/sites\/12\/2019\/05\/meddelelsen-521-cloudflare-wordpress-1.png\" alt=\"Et eksempel p\u00e5 Error 521-meddelelsen\" width=\"1439\" height=\"874\"><figcaption class=\"wp-caption-text\">Et eksempel p\u00e5 Error 521-meddelelsen<\/figcaption><\/figure>\n<h3><a id=\"cause\"><\/a>Hvad er \u00e5rsagen til Error 521-meddelelsen?<\/h3>\n<p>Error 521-meddelelsen er typisk for\u00e5rsaget af en af \u200b\u200bto situationer:<\/p>\n<p>F\u00f8rst kan dit WordPress-websteds server muligvis v\u00e6re nede. Selvom alt andet er konfigureret korrekt, hvis dit WordPress-websteds server er offline, vil Cloudflare simpelthen ikke v\u00e6re i stand til at oprette forbindelse.<\/p>\n<p>For det andet k\u00f8rer din webserver muligvis fint, men blokerer Cloudflares anmodninger af en eller anden grund. P\u00e5 grund af hvordan Cloudflare fungerer, kan nogle sikkerhedsl\u00f8sninger p\u00e5 serversiden muligvis uforvarende blokere Cloudflares IP-adresser.<\/p>\n<p>Da Cloudflare er en <a href=\"https:\/\/kinsta.com\/dk\/blog\/reverse-proxy\/\">omvendt proxy<\/a>, vises al den trafik, der kommer til din originalserver, som om den kommer fra en lille r\u00e6kke Cloudflare-IP&#8217;er (snarere end hver enkelt bes\u00f8gendes unikke IP-adresse). Som s\u00e5dan vil nogle sikkerhedsl\u00f8sninger se stor trafik fra et begr\u00e6nset antal IP-adresser som et angreb og blokere dem.<\/p>\n<p>N\u00e5r det sker, vil Cloudflare ikke kunne oprette forbindelse, og vises i stedet meddelelsen Error\u00a0 521.<\/p>\n<h2><a id=\"fix\"><\/a>S\u00e5dan rettes Error 521 til Cloudflare og WordPress<\/h2>\n<p>Nu hvor du ved, hvad der sker, s\u00e5 lad os grave dig ind i, hvordan du l\u00f8ser Error 521 i WordPress.<\/p>\n<h3>Trin 1: Test, om originalserveren er online<\/h3>\n<p>Inden du g\u00e5r videre, skal du sikre dig, at dit WordPress-websteds server er online og fungerer normalt. Hvis det ikke er, er der ingen mening at grave i yderligere fejlfindingstrin.<\/p>\n<p>For at teste dette kan du k\u00f8re en cURL-kommando. Hvis du er p\u00e5 Mac eller Linux, kan du k\u00f8re dette lige fra Terminal.<\/p>\n<p>Windows har ikke CURL installeret som standard, og selvom du kan installere det, er en enklere m\u00e5de at <a href=\"https:\/\/tools.keycdn.com\/curl\">bruge KeyCDNs online HTTP Header Check-v\u00e6rkt\u00f8j.<\/a><\/p>\n<p>Alt, hvad du g\u00f8r, er at tilslutte <strong>http:\/\/1.2.3.4<\/strong>, hvor 1.2.3.4 er den aktuelle IP-adresse p\u00e5 din server.<\/p>\n<figure style=\"width: 1691px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/dk\/wp-content\/uploads\/sites\/12\/2019\/05\/error-521-cloudflare-wordpress-2.png\" alt=\"KeyCDN Header Check v\u00e6rkt\u00f8jet\" width=\"1691\" height=\"940\"><figcaption class=\"wp-caption-text\">KeyCDN Header Check v\u00e6rkt\u00f8jet<\/figcaption><\/figure>\n<p>Hvis du er hoster hos Kinsta, kan du finde din server-IP-adresse under fanen <strong>Websteder<\/strong>:<\/p>\n<figure style=\"width: 2004px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/dk\/wp-content\/uploads\/sites\/12\/2019\/05\/error-521-cloudflare-wordpress-3.png\" alt=\"Hvor finder du din Kinsta-server IP-adresse\" width=\"2004\" height=\"914\"><figcaption class=\"wp-caption-text\">Hvor finder du din Kinsta-server IP-adresse<\/figcaption><\/figure>\n<p>Eller du kan ogs\u00e5 tage det fra <strong>A<\/strong> Record til dit dom\u00e6ne i <strong>DNS<\/strong>-omr\u00e5det i Cloudflare web dashboard.<\/p>\n<p>Hvis din server er oppe, skal du se et <strong>HTTP 200<\/strong> svar. Eller, hvis du er hoster hos Kinsta, ser du <strong>404 Not Found<\/strong>, hvilket ogs\u00e5 betyder, at webserveren er oppe (der er bare ingen side tilknyttet denne IP):<\/p>\n<figure style=\"width: 1756px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/dk\/wp-content\/uploads\/sites\/12\/2019\/05\/error-521-cloudflare-wordpress-4.png\" alt=\"Et eksempel p\u00e5 en vellykket forbindelse\" width=\"1756\" height=\"558\"><figcaption class=\"wp-caption-text\">Et eksempel p\u00e5 en vellykket forbindelse<\/figcaption><\/figure>\n<p>Hvis der er et problem, kan du se noget som <strong>Host ikke fundet<\/strong> eller <strong>mislykkede med at oprette forbindelse:<\/strong><\/p>\n<figure style=\"width: 1589px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/dk\/wp-content\/uploads\/sites\/12\/2019\/05\/error-521-cloudflare-wordpress-5.png\" alt=\"Et eksempel p\u00e5 et problem med din server\" width=\"1589\" height=\"368\"><figcaption class=\"wp-caption-text\">Et eksempel p\u00e5 et problem med din server<\/figcaption><\/figure>\n<p>Hvis der er et problem med din server, og du ikke er sikker p\u00e5, hvad der foreg\u00e5r, skal du kontakte din hosts support (<a href=\"https:\/\/kinsta.com\/docs\/support\/contact-support\/\">du kan f\u00e5 adgang til Kinsta-support hvor som helst p\u00e5 dit dashboard<\/a> via intercomwidget).<\/p>\n<h3>Trin 2: Hvidliste over alle Cloudflare IP-intervaller i serverens firewall<\/h3>\n<p>Hvis dit WordPress-websteds server fungerer normalt, men du stadig ser meddelelsen Fejl 521, n\u00e5r du pr\u00f8ver at f\u00e5 adgang til dit websted, er det n\u00e6ste trin at hvidliste alle Cloudflares IP-intervaller for at sikre dig, at din server ikke blokerer dem.<\/p>\n<p><a href=\"https:\/\/www.cloudflare.com\/ips\/\">Her er en komplet liste over Cloudflares IP-intervaller.<\/a><\/p>\n<p>Du skal sikre dig, at du ikke blokerer for disse IP-adresser i <a href=\"https:\/\/kinsta.com\/dk\/blog\/wordpress-htaccess-fil\/\">.htaccess<\/a>, <strong>iptables<\/strong> eller din firewall. Og du vil ogs\u00e5 sikre dig, at din hosting-udbyder ikke takserer eller begr\u00e6nser IP-anmodninger fra Cloudflares IP-adresser.<\/p>\n<p>Hvis du ikke er sikker p\u00e5, hvordan du g\u00f8r dette, skal du kontakte din hosts support. Hos Kinsta skal disse IP-intervaller allerede hvidlistes.<\/p>\n<h3>Trin 3: Overvej mere specifikke problemer<\/h3>\n<p>Endelig er her nogle mere specifikke tekniske trin, du kan tage, afh\u00e6ngigt af din servers konfiguration.<\/p>\n<p><strong>1)<\/strong> Hvis du lige er begyndt at bruge Cloudflares HTTPS, er din originalserver muligvis ikke konfigureret til at give Cloudflares IP-adresser adgang til port 443. Hvis du ikke kan konfigurere din firewall til at tillade dette, kan du pr\u00f8ve at bruge <strong>Fleksibel SS<\/strong>L i stedet for <strong>Fuld SSL<\/strong> p\u00e5 Cloudflare.<\/p>\n<p><strong>2)<\/strong> S\u00f8rg for, at du bruger de nyeste versioner af <strong>Bad Behavior<\/strong> eller <strong>mod_security<\/strong>, hvis relevant.<\/p>\n<p><strong>3)<\/strong> Hvis du bruger <strong>mod_antiloris<\/strong> eller <strong>mod_reqtimeout<\/strong> Apache-moduler, skal du deaktivere og fjerne disse moduler.<\/p>\n<h2>Konklusion<\/h2>\n<p>Hvis du er hoster hos Kinsta og stadig oplever 521 Error efter implementering af disse tweaks, vil vores support v\u00e6re i stand til at hj\u00e6lpe &#8211; bare n\u00e5 ud via Intercom-chatwidget i dit Konsta dashboard.<\/p>\n<p>Foresl\u00e5et l\u00e6sning: <a href=\"https:\/\/kinsta.com\/dk\/blog\/cloudflare-apo-wordpress\/\">S\u00e5dan oprettes Cloudflare APO til WordPress<\/a>, og <a href=\"https:\/\/kinsta.com\/blog\/ssl-handshake-failed\/\">hvordan man l\u00f8ser fejlen &#8220;SSL handshake mislykkedes&#8221; (5 metoder)<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Error 521 er en Cloudflare-specifik fejlmeddelelse, der vises, n\u00e5r dit WordPress-websteds server afviser en forbindelse med Cloudflare. I dette indl\u00e6g l\u00e6rer du: Mere om, hvad Error &#8230;<\/p>\n","protected":false},"author":103,"featured_media":32800,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[126,2],"topic":[685,758],"class_list":["post-32793","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-cloudflare","tag-wordpress","topic-cloudflare","topic-wordpress-problemer"],"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>S\u00e5dan rettes 521 Error med WordPress og Cloudflare<\/title>\n<meta name=\"description\" content=\"Error 521 er en fejlmeddelelse, der er specifik for Cloudflare. L\u00e6r, hvordan du l\u00f8ser det og f\u00e5r dit WordPress site til at fungere igen.\" \/>\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\/dk\/blog\/error-521\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"S\u00e5dan rettes 521 Error med WordPress og Cloudflare\" \/>\n<meta property=\"og:description\" content=\"Error 521 er en fejlmeddelelse, der er specifik for Cloudflare. L\u00e6r, hvordan du l\u00f8ser det og f\u00e5r dit WordPress site til at fungere igen.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinsta.com\/dk\/blog\/error-521\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Kinsta-Danmark-122855885298660\/\" \/>\n<meta property=\"article:published_time\" content=\"2019-08-15T16:04:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-01T19:06:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kinsta.com\/dk\/wp-content\/uploads\/sites\/12\/2019\/08\/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=\"Error 521 er en fejlmeddelelse, der er specifik for Cloudflare. 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