{"id":8181,"date":"2026-10-29T11:54:32","date_gmt":"2026-10-29T10:54:32","guid":{"rendered":"https:\/\/computerservice.arminfischer.com\/news\/?p=8181"},"modified":"2026-10-29T13:53:49","modified_gmt":"2026-10-29T12:53:49","slug":"json-fehler-gutenberg-editor-firewall-blockade","status":"publish","type":"post","link":"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/","title":{"rendered":"Wenn die Server-Firewall zuschl\u00e4gt: Warum versch\u00e4rfte Sicherheitsregeln pl\u00f6tzliche JSON-Fehler im Gutenberg-Editor verursachen"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/#JSON-Fehler_Gutenberg_Editor\" >JSON-Fehler Gutenberg Editor<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/#Was_uns_nach_PHP2Shell_bleibt\" >Was uns nach PHP2Shell bleibt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/#Die_Ursache_Ein_%E2%80%9CSilent_Bug%E2%80%9D_trifft_auf_die_digitale_Haustur-Security\" >Die Ursache: Ein &#8220;Silent Bug&#8221; trifft auf die digitale Haust\u00fcr-Security<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/#Was_wir_versucht_haben_Die_Sackgassen_der_Fehlerbehebung\" >Was wir versucht haben: Die Sackgassen der Fehlerbehebung<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/#Die_Losung_fur_Webdesigner_Agenturen_und_Laien\" >Die L\u00f6sung f\u00fcr Webdesigner, Agenturen und Laien<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/#PHP-Sicherheitslucke_Warum_Webseiten_und_Dienste_im_Internet_gerade_nicht_wie_gewohnt_laufen_und_was_Webmaster_und_Hoster_tun_mussen_Computerservicearminfischercom_https_computerservicearminfischercomnews8156\" >PHP-Sicherheitsl\u00fccke: Warum Webseiten und Dienste im Internet gerade nicht wie gewohnt laufen und was Webmaster und Hoster tun m\u00fcssen . Computerservicearminfischercom . https:\/\/computerservice.arminfischer.com\/news\/8156\/&nbsp;.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/#Computerservicearminfischercom\" >Computerservice.arminfischer.com<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JSON-Fehler_Gutenberg_Editor\"><\/span>JSON-Fehler Gutenberg Editor<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Wenn die Server-Firewall zuschl\u00e4gt: Warum versch\u00e4rfte Sicherheitsregeln pl\u00f6tzliche JSON-Fehler im Gutenberg-Editor verursachen . Computerservicearminfischercom . https:\/\/computerservice.arminfischer.com\/news\/8181\/ . <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/wordpress\/\">#WordPress<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/gutenberg\/\">#Gutenberg<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webdesign\/\">#Webdesign<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/cybersecurity\/\">#Cybersecurity<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/nevefse\/\">#NeveFSE<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webmaster\/\">#Webmaster<\/a> #ITSupport #Computerservicearminfischercom <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/memmelsdorf\/\">#Memmelsdorf<\/a>  #GemeindeMemmelsdorf  <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/json\/\">#JSON<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/jsonfehler\/\">#JSONFehler<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/php2shell\/\">#PHP2Shell<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webapplicationfirewalls\/\">#WebApplicationFirewalls<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/waf\/\">#WAF<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webdesigner\/\">#Webdesigner<\/a> <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webhoster\/\">#Webhoster<\/a> ,<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Was_uns_nach_PHP2Shell_bleibt\"><\/span>Was uns nach <a href=\"https:\/\/computerservice.arminfischer.com\/news\/8156\/\" target=\"_blank\" rel=\"noreferrer noopener\">PHP2Shell<\/a> bleibt <span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Wer in den letzten Tagen versucht hat, seine WordPress-Website zu bearbeiten \u2013 insbesondere den Header- oder Footer-Bereich in modernen Block-Themes (Full Site Editing \/ FSE) \u2013, erlebte mancherorts eine b\u00f6se \u00dcberraschung. Beim Klick auf den Speicher-Button verweigert WordPress pl\u00f6tzlich den Dienst. Zur\u00fcck bleibt folglich eine frustrierende Fehlermeldung: \u201e<strong>Die Antwort ist keine g\u00fcltige JSON-Antwort<\/strong>\u201c oder hartn\u00e4ckige Verbindung-Verloren-Meldungen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Was wie ein pl\u00f6tzlicher Programmierfehler im Theme aussieht, entpuppt sich jedoch bei genauerem Hinsehen als ein massives Zusammenspiel. Grund daf\u00fcr ist das j\u00fcngste globale PHP-Sicherheitsupdate (PHP2Shell Fix) und die interne Architektur von WordPress.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Daher betrifft das Problem keineswegs nur ein einzelnes Produkt. Prominente Block-Themes wie <strong>Neve FSE<\/strong>, aber auch <strong>die offiziellen WordPress-Standard-Themes<\/strong> wie<strong> Twenty Twenty-Four<\/strong> oder <strong>Twenty Twenty-Five<\/strong> <strong>schlugen<\/strong> bei manchen <strong>Webhostern<\/strong> pl\u00f6tzlich <strong>Alarm<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Die_Ursache_Ein_%E2%80%9CSilent_Bug%E2%80%9D_trifft_auf_die_digitale_Haustur-Security\"><\/span>Die Ursache: Ein &#8220;Silent Bug&#8221; trifft auf die digitale Haust\u00fcr-Security<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Um die kritischen PHP2Shell-Sicherheitsl\u00fccken im Oktober 2026 zu schlie\u00dfen, haben Webhoster und Server-Administratoren weltweit Sicherheitsregeln auf ihren Web Application Firewalls (WAF) und ModSecurity-Systemen drastisch versch\u00e4rft. Diese Firewalls scannen jede Daten\u00fcbertragung im Hintergrund ab, um Angriffe abzuwehren.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hier kollidiert die Security nun mit dem offiziellen WordPress-Standard. WordPress nutzt f\u00fcr die REST-Schnittstelle im Full Site Editing eine spezifische Notation mit zwei Schr\u00e4gstrichen:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>...\/wp-json\/wp\/v2\/template-parts\/neve-fse\/\/header<\/code><br>oder entsprechend<br><code>...\/wp-json\/wp\/v2\/template-parts\/twentytwentyfour\/\/header<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dieser doppelte Schr\u00e4gstrich (<code>\/\/<\/code>) ist von den WordPress-Core-Entwicklern absolut beabsichtigt und dokumentiert. Dennoch interpretieren die versch\u00e4rften Server-Firewalls genau diese doppelten Schr\u00e4gstriche seit dem Sicherheits-Fix als potenziellen Angriffsversuch (Directory Traversal). Infolgedessen blockiert die Firewall die Anfrage sofort. Der Server liefert daraufhin einen Statuscode 503 (Service Unavailable) oder 403 (Forbidden) als HTML-Seite aus, und Gutenberg meldet den bekannten JSON-Fehler. <strong>Angriffsversuch (Directory Traversal \u2013 das Einschleusen von Pfaden). <\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Was_wir_versucht_haben_Die_Sackgassen_der_Fehlerbehebung\"><\/span>Was wir versucht haben: Die Sackgassen der Fehlerbehebung<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Bei der Analyse auf betroffenen Systemen haben wir verschiedene L\u00f6sungsans\u00e4tze getestet, die in diesem speziellen Szenario leider wirkungslos blieben:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Der PHP-Filter-Ansatz (Erfolglos):<\/strong> Ein PHP-Snippet \u00fcber Plugins wie WPCode, das die REST-Route vor der Ausf\u00fchrung korrigieren sollte (<code>rest_pre_dispatch<\/code>), lief ins Leere. Schlie\u00dflich blockiert die Firewall den Aufruf, noch bevor WordPress \u00fcberhaupt gestartet wird. <\/li>\n\n\n\n<li><strong>Der Browser-JavaScript-Fix (Erfolglos):<\/strong> Der Versuch, den Pfad mittels JavaScript direkt im Opera- oder Chrome-Browser vor dem Absenden zu manipulieren, scheiterte ebenfalls bei besonders restriktiven Hostern. Diese scannten nicht nur die URL, sondern blockierten au\u00dferdem den gesamten Dateninhalt (POST-Body) der Anfrage.<\/li>\n\n\n\n<li><strong>Interne Server-Umleitung per <code>.htaccess<\/code> (Erfolglos):<\/strong> Ein internes Umschreiben der URL auf Server-Ebene mittels Apache <code>mod_rewrite<\/code> griff gleicherma\u00dfen nicht. Das liegt daran, dass die \u00fcbergeordnete WAF-Schutzschicht des Hosters der<code>.htaccess<\/code>-Verarbeitung vorgeschaltet ist.<br><br><\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Die_Losung_fur_Webdesigner_Agenturen_und_Laien\"><\/span>Die L\u00f6sung f\u00fcr Webdesigner, Agenturen und Laien<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Die gute Nachricht vorweg: F\u00fcr viele Webseiten entspannt sich die Situation bereits wieder, da Webhoster ihre fehlerhaften Filtereinstellungen (False Positives) korrigieren und an den WordPress-Standard anpassen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dennoch gilt f\u00fcr die Zukunft ein wichtiger Grundsatz:<strong> Ein Webdesigner muss auch unter versch\u00e4rften Firewall-Bedingungen in der Lage sein, grundlegende Design- und Theme-\u00c4nderungen im Admin-Bereich vorzunehmen<\/strong>. Die Handlungsf\u00e4higkeit von Agenturen und Administratoren darf schlie\u00dflich nicht durch \u00fcbereilte Server-Regeln blockiert werden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sofortige Ma\u00dfnahmen, falls der Fehler bei dir auftritt:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Der Hoster-Support:<\/strong> Kontaktiere deinen Webhoster. \u00dcbermittle ihm den blockierten Pfad (sichtbar in den Entwicklertools des Browsers unter  <code>F12<\/code>  \u203a Netzwerk) und bitte darum, die entsprechende WAF-Regel oder ModSecurity-ID f\u00fcr die REST-API auf die Whitelist zu setzen.<\/li>\n\n\n\n<li><strong>Der Template-Workaround:<\/strong> Der Template-Workaround: Erstelle im WordPress-Editor unter Template-Teile ein komplett neues Element mit einem individuellen Namen (z.B. <code>mein-eigener-header<\/code>). Dadurch umgehst du das Standard-Wort <code>neve-fse<\/code> oder <code>twentytwenty<\/code> im URL-Pfad. F\u00fcge dort deinen Header-Code ein und binde diesen blockadesicheren Block in deine Templates ein.<\/li>\n\n\n\n<li><\/li>\n\n\n\n<li>Erstelle im WordPress-Editor unter <em>Template-Teile<\/em> ein komplett neues Element mit einem individuellen Namen (z.B. <code>mein-eigener-header<\/code>), welcher das Standard-Wort <code>neve-fse<\/code> oder <code>twentytwenty<\/code> im URL-Pfad umgeht. F\u00fcge dort deinen Header-Code ein und binde diesen blockadesicheren Block in deine Templates ein.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Wir bleiben f\u00fcr dich an den aktuellen IT- und Webdesign-Entwicklungen dran, um deine WordPress-Projekte sicher und funktionsf\u00e4hig zu halten!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kontakt zu FSE , Berichten des Problems: <br><a href=\"https:\/\/github.com\/Codeinwp\/neve-fse\/issues\/208#issuecomment-6469274447\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/github.com\/Codeinwp\/neve-fse\/issues\/208#issuecomment-6469274447<\/a> <\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PHP-Sicherheitslucke_Warum_Webseiten_und_Dienste_im_Internet_gerade_nicht_wie_gewohnt_laufen_und_was_Webmaster_und_Hoster_tun_mussen_Computerservicearminfischercom_https_computerservicearminfischercomnews8156\"><\/span>PHP-Sicherheitsl\u00fccke: Warum Webseiten und Dienste im Internet gerade nicht wie gewohnt laufen und was Webmaster und Hoster tun m\u00fcssen . Computerservicearminfischercom . <a href=\"https:\/\/computerservice.arminfischer.com\/news\/8156\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/computerservice.arminfischer.com\/news\/8156\/<\/a>&nbsp;. <span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><br><br><a href=\"https:\/\/computerservice.arminfischer.com\/news\/8156\/php-sicherheitsluecke-php2shell-webmaster-hoster\/\">https:\/\/computerservice.arminfischer.com\/news\/8156\/php-sicherheitsluecke-php2shell-webmaster-hoster\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Keywords: <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">WordPress , Gutenberg , Webdesign , Cybersecurity , NeveFSE , Neve FSE , Webmaster , ITSupport , IT-Support , IT Support ,   Computerservicearminfischercom , Computerservice.arminfischer.com , Memmelsdorf , GemeindeMemmelsdorf , Gemeinde Memmelsdorf ,  JSON ,  JSON-Fehler , PHP2Shell , Die Antwort ist keine g\u00fcltige JSON-Antwort , Web Application Firewall , Web Application Firewalls , WAF , Webdesigner , Webhoster , <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hashtags:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/wordpress\/\">#WordPress<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/gutenberg\/\">#Gutenberg<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webdesign\/\">#Webdesign<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/cybersecurity\/\">#Cybersecurity<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/nevefse\/\">#NeveFSE<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webmaster\/\">#Webmaster<\/a> , #ITSupport , #Computerservicearminfischercom , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/memmelsdorf\/\">#Memmelsdorf<\/a> , #GemeindeMemmelsdorf , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/json\/\">#JSON<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/jsonfehler\/\">#JSONFehler<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/php2shell\/\">#PHP2Shell<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webapplicationfirewalls\/\">#WebApplicationFirewalls<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/waf\/\">#WAF<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webdesigner\/\">#Webdesigner<\/a> , <a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/webhoster\/\">#Webhoster<\/a> , <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"415\" src=\"https:\/\/computerservice.arminfischer.com\/news\/wp-content\/uploads\/2026\/04\/c-logoschrift_bg-transp-1024x415.png\" alt=\"C Logo &amp; Text . contour black. . Computerservice.arminfischer.com office@arminfischer.com +4917621008967 . https:\/\/Computerservice.arminfischer.com .\" class=\"wp-image-7579\" style=\"aspect-ratio:2.4675824540447278;width:383px;height:auto\" srcset=\"https:\/\/computerservice.arminfischer.com\/news\/wp-content\/uploads\/2026\/04\/c-logoschrift_bg-transp-1024x415.png 1024w, https:\/\/computerservice.arminfischer.com\/news\/wp-content\/uploads\/2026\/04\/c-logoschrift_bg-transp-300x121.png 300w, https:\/\/computerservice.arminfischer.com\/news\/wp-content\/uploads\/2026\/04\/c-logoschrift_bg-transp-768x311.png 768w, https:\/\/computerservice.arminfischer.com\/news\/wp-content\/uploads\/2026\/04\/c-logoschrift_bg-transp-1536x622.png 1536w, https:\/\/computerservice.arminfischer.com\/news\/wp-content\/uploads\/2026\/04\/c-logoschrift_bg-transp.png 1640w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Computerservicearminfischercom\"><\/span>Computerservice.arminfischer.com <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">.<br>.<br>Armin Fischer<br>.<br>Computerservice.arminfischer.com<br>Computer, Handy, Telefon oder Router streikt? AKUT-FERNWARTUNG f\u00fcr Privatleute und kleinere Unternehmen.<br>.<br>.<br>Computerservice.arminfischer.com<br><a href=\"mailto:office@arminfischer.com\">office@arminfischer.com<\/a><br>+4917621008967<br>.<br>Computerservice.arminfischer.com<br>c\/o Armin Fischer<br>Hauptstr. 70<br>DE- 96117 Memmelsdorf<br>Ust.ID\/ VAT ID: DE232723558<br>W-IdNr. : DE414567606<br>.<br>Tel. +4995125295367 &#8211; Tel. +49951252953670 &#8211; Fax +49951252953673<br>.<br><a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/termin\/\">#Termin<\/a><br><a href=\"http:\/\/kalender.arminfischer.com\">http:\/\/kalender.arminfischer.com<\/a><br><a href=\"http:\/\/calendly.com\/arminfischercom\/30min\/\">http:\/\/calendly.com\/arminfischercom\/30min\/<\/a><br>.<br><a href=\"https:\/\/computerservice.arminfischer.com\/news\/tag\/chat\/\">#Chat<\/a><br><a href=\"http:\/\/Computerservice.arminfischer.com\/chatus\/\">http:\/\/Computerservice.arminfischer.com\/chatus\/<\/a><br>.<br><a href=\"http:\/\/computerservice.arminfischer.com\/news\/\">http:\/\/computerservice.arminfischer.com\/news\/<\/a><br><a href=\"http:\/\/Computerservice.arminfischer.com\">http:\/\/Computerservice.arminfischer.com<\/a><br><a href=\"http:\/\/linktr.ee\/Computerservicearminfischercom\/\">http:\/\/linktr.ee\/Computerservicearminfischercom\/<\/a><br>.<br>.<br>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Computerservice.arminfischer.com \/\/ Armin Fischer Dienstleistungen \/\/ <a href=\"https:\/\/handinhand.arminfischer.com\" target=\"_blank\" rel=\"noreferrer noopener\">HandinHand.arminfischer.com<\/a> &amp; Hand in Hand Alltagshelfer UG <a href=\"http:\/\/www.handinhand-alltagshelfer.de\">www.handinhand-alltagshelfer.de<\/a> . Alltagshelfer , Pflegeberatung . \/\/ <a href=\"https:\/\/digitaleseniorenhilfe.arminfischer.com\" target=\"_blank\" rel=\"noreferrer noopener\">digitaleseniorenhilfe.arminfischer.com<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">---<br>.<br>.<br>Armin Fischer <br>.<br>Computerservice.arminfischer.com <br>Computer, Handy, Telefon oder Router streikt? AKUT-FERNWARTUNG f\u00fcr Privatleute und kleinere Unternehmen. <br>.<br>. <br>Computerservice.arminfischer.com <br><a href=\"mailto:office@arminfischer.com\">office@arminfischer.com<\/a>  <br>+4917621008967 <br>. <br>Computerservice.arminfischer.com <br>c\/o Armin Fischer <br>Hauptstr. 70 <br>DE- 96117 Memmelsdorf  <br>Ust.ID\/ VAT ID: DE232723558 <br>W-IdNr. : DE414567606<br>. <br>Tel. +4995125295367 - Tel. +49951252953670 - Fax +49951252953673 <br>.<br>#Termin  <br><a href=\"http:\/\/kalender.arminfischer.com\">http:\/\/kalender.arminfischer.com<\/a> <br><a href=\"http:\/\/calendly.com\/arminfischercom\/30min\/\">http:\/\/calendly.com\/arminfischercom\/30min\/<\/a> <br>.<br>#Chat<br><a href=\"http:\/\/Computerservice.arminfischer.com\/chatus\/\">http:\/\/Computerservice.arminfischer.com\/chatus\/<\/a> <br>.<br><a href=\"http:\/\/computerservice.arminfischer.com\/news\/\">http:\/\/computerservice.arminfischer.com\/news\/<\/a> <br><a href=\"http:\/\/Computerservice.arminfischer.com\">http:\/\/Computerservice.arminfischer.com<\/a> <br><a href=\"http:\/\/linktr.ee\/Computerservicearminfischercom\/\">http:\/\/linktr.ee\/Computerservicearminfischercom\/<\/a> <br>.<br>.<br>. <br><br><a href=\"https:\/\/Computerservice.arminfischer.com\" target=\"_blank\" rel=\"noreferrer noopener\">Computerservice.arminfischer.com<\/a>  \/\/ Armin Fischer Dienstleistungen \/\/ <a href=\"https:\/\/handinhand.arminfischer.com\" target=\"_blank\" rel=\"noreferrer noopener\">HandinHand.arminfischer.com<\/a> &amp; Hand in Hand Alltagshelfer UG <a href=\"http:\/\/www.handinhand-alltagshelfer.de\">www.handinhand-alltagshelfer.de<\/a> . Alltagshelfer , Pflegeberatung . \/\/ <a href=\"https:\/\/digitaleseniorenhilfe.arminfischer.com\" target=\"_blank\" rel=\"noreferrer noopener\">digitaleseniorenhilfe.arminfischer.com<\/a><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>JSON-Fehler Gutenberg Editor Wenn die Server-Firewall zuschl\u00e4gt: Warum versch\u00e4rfte Sicherheitsregeln pl\u00f6tzliche JSON-Fehler im Gutenberg-Editor verursachen . Computerservicearminfischercom . https:\/\/computerservice.arminfischer.com\/news\/8181\/ .<\/p>\n","protected":false},"author":2,"featured_media":7738,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5973,2540,5975,2537,6293,6294,1179,5981,5841,1180,5983,2231,5985,1730,111,5843,2539,9275,2538,2838,6937,5869,1186,1187,5871,5873,51,7357,35,5875,9659,9684,6681,9801,5991,1109,5883,42,6682,9794,6001,2688,2692,6003,2686,6005,9796,9798,9799,6274,6678,2841,7927,7921,7926,6011,1111,1107,6013,41,5887,1106,1108,6015,5889,43,9802,2490,6019,2491,1112,6021,9797,9795,9804,9803,9800,244,5903,242,5905,5907,243,6025,1110,5919,1132,859,2844,2843],"tags":[194,172,410,2023,7665,9805,9808,9809,9,9806,9792,2022,9811,9810,654,9812,1124,9807,453],"class_list":["post-8181","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-acuteremotemaintenance-de","category-acuteremotemaintenance","category-akutfernwartung-de","category-akutfernwartung","category-computernotdienst","category-computernotdienstgemeindememmelsdorf","category-computerrepair","category-computerrepair-de","category-computerreparatur-de","category-computerreparatur","category-computerservicearminfischercom-de","category-computerservicearminfischercom","category-fernwartung-de","category-fernwartung","category-gemeindememmelsdorf","category-gemeindememmelsdorf-de","category-acute-remote-maintenance","category-aktuelles-news","category-akut-fernwartung","category-computer-3","category-computer-emergency-service","category-computerrepair-2-de","category-computerrepair-2","category-computerreparatur-3","category-computerreparatur-3-de","category-computerservice-arminfischer-com-de","category-computerservice-arminfischer-com","category-computerservice-arminfischer-com-news","category-county-bamberg","category-county-bamberg-de","category-cyberangriff","category-cyberattack","category-deutsch-de-de","category-die-antwort-ist-keine-gultige-json-antwort","category-drosendorf-de","category-drosendorf","category-gemeinde-memmelsdorf-de","category-gemeinde-memmelsdorf","category-german-de-de","category-gutenberg","category-internet-gemeinde-memmelsdorf-de","category-internet-gemeinde-memmelsdorf","category-internet-landkreis-bamberg","category-internet-landkreis-bamberg-de","category-internet-memmelsdorf","category-internet-memmelsdorf-de","category-json","category-json-fehler","category-json-fehler-gutenberg-editor","category-kremmeldorf","category-languages","category-laptop","category-laubend-gemeinde-memmelsdorf-de","category-laubend","category-laubend-gemeinde-memmelsdorf","category-lichteneiche-de","category-lichteneiche","category-meedensdorf","category-meedensdorf-de","category-memmelsdorf","category-memmelsdorf-gemeinde-memmelsdorf-de","category-memmelsdorf-gemeinde-memmelsdorf","category-merkendorf","category-merkendorf-de","category-municipality-memmelsdorf-de","category-municipality-memmelsdorf","category-neve-fse","category-schesslitz","category-schesslitz-de","category-scheslitz","category-schmerldorf","category-schmerldorf-de","category-server-firewall","category-themes","category-twenty-twenty-five","category-twenty-twenty-four","category-was-uns-nach-php2shell-bleibt","category-webdesign","category-webdesign-de","category-webseite","category-webseite-de","category-website-de","category-website","category-weichendorf-de","category-weichendorf","category-wordpress-de","category-wordpress-4","category-wordpress","category-wordpress-gemeinde-memmelsdorf","category-wordpress-memmelsdorf","tag-computerservicearminfischercom","tag-gemeindememmelsdorf","tag-itsupport","tag-chathttp","tag-cybersecurity","tag-gutenberg","tag-json","tag-jsonfehler","tag-memmelsdorf","tag-nevefse","tag-php2shell","tag-terminhttp","tag-waf","tag-webapplicationfirewalls","tag-webdesign","tag-webdesigner","tag-webhoster","tag-webmaster","tag-wordpress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>JSON-Fehler in WordPress: So blockieren Server-Firewalls<\/title>\n<meta name=\"description\" content=\"WordPress-Header kann nicht speichern? Erfahre, warum versch\u00e4rfte Hoster-Firewalls nach dem PHP-Fix ung\u00fcltige JSON-Antworten erzwingen.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/computerservice.arminfischer.com\/news\/8181\/json-fehler-gutenberg-editor-firewall-blockade\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JSON-Fehler in WordPress: So blockieren Server-Firewalls\" \/>\n<meta property=\"og:description\" content=\"WordPress-Header kann nicht speichern? 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