{"id":5048,"date":"2026-11-05T08:00:00","date_gmt":"2026-11-05T08:00:00","guid":{"rendered":"https:\/\/netguide.io\/linux\/?p=5048"},"modified":"2026-11-05T08:00:00","modified_gmt":"2026-11-05T08:00:00","slug":"ssh-remote-host-identification-has-changed","status":"publish","type":"post","link":"https:\/\/netguide.io\/linux\/de\/ssh-remote-host-identification-has-changed\/","title":{"rendered":"SSH: \u201eREMOTE HOST IDENTIFICATION HAS CHANGED\u201c beheben"},"content":{"rendered":"<script type=\"text\/plain\" data-tcf=\"waiting-for-consent\" data-id=\"4797\" data-bid=\"2\" data-placement=\"4798\">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<\/script>\n<p class=\"wp-block-paragraph\">Beim Verbinden per SSH erscheint pl\u00f6tzlich eine gro\u00dfe Warnung: <strong>\u201eWARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!&#8221;<\/strong> und die Verbindung wird blockiert? Das bedeutet, dass sich der Server-Schl\u00fcssel ge\u00e4ndert hat. In dieser Anleitung erkl\u00e4ren wir, was dahintersteckt und wie du es behebst.<\/p>\n\n\n\t\t\t\t<div class=\"wp-block-uagb-table-of-contents uagb-toc__align-left uagb-toc__columns-1  uagb-block-1ffd1ad5      \"\n\t\t\t\t\tdata-scroll= \"1\"\n\t\t\t\t\tdata-offset= \"30\"\n\t\t\t\t\tstyle=\"\"\n\t\t\t\t>\n\t\t\t\t<div class=\"uagb-toc__wrap\">\n\t\t\t\t\t\t<div class=\"uagb-toc__title\">\n\t\t\t\t\t\t\tInhaltsverzeichnis\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"uagb-toc__list-wrap \">\n\t\t\t\t\t\t<ol class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#was-bedeutet-die-warnung\" class=\"uagb-toc-link__trigger\">Was bedeutet die Warnung?<\/a><li class=\"uagb-toc__list\"><a href=\"#wann-ist-die-warnung-harmlos\" class=\"uagb-toc-link__trigger\">Wann ist die Warnung harmlos?<\/a><li class=\"uagb-toc__list\"><a href=\"#l\u00f6sung-den-alten-host-schl\u00fcssel-entfernen\" class=\"uagb-toc-link__trigger\">L\u00f6sung: Den alten Host-Schl\u00fcssel entfernen<\/a><li class=\"uagb-toc__list\"><a href=\"#wann-du-vorsichtig-sein-solltest\" class=\"uagb-toc-link__trigger\">Wann du vorsichtig sein solltest<\/a><li class=\"uagb-toc__list\"><a href=\"#h\u00e4ufige-fragen\" class=\"uagb-toc-link__trigger\">H\u00e4ufige Fragen<\/a><li class=\"uagb-toc__list\"><a href=\"#ist-die-warnung-ein-zeichen-f\u00fcr-einen-hackerangriff\" class=\"uagb-toc-link__trigger\">Ist die Warnung ein Zeichen f\u00fcr einen Hackerangriff?<\/a><li class=\"uagb-toc__list\"><a href=\"#kann-ich-die-pr\u00fcfung-einfach-abschalten\" class=\"uagb-toc-link__trigger\">Kann ich die Pr\u00fcfung einfach abschalten?<\/a><li class=\"uagb-toc__list\"><a href=\"#wo-finde-ich-die-gespeicherten-schl\u00fcssel\" class=\"uagb-toc-link__trigger\">Wo finde ich die gespeicherten Schl\u00fcssel?<\/a><li class=\"uagb-toc__list\"><a href=\"#fazit\" class=\"uagb-toc-link__trigger\">Fazit<\/a><\/ol>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Was bedeutet die Warnung?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SSH merkt sich beim ersten Verbinden den Fingerabdruck (Host-Schl\u00fcssel) des Servers in der Datei <code>~\/.ssh\/known_hosts<\/code>. Weicht der Schl\u00fcssel beim n\u00e4chsten Mal ab, schl\u00e4gt SSH Alarm \u2013 zum Schutz vor einem m\u00f6glichen \u201eMan-in-the-Middle&#8221;-Angriff.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Wann ist die Warnung harmlos?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In den meisten F\u00e4llen ist die Ursache banal: Der Server wurde <strong>neu installiert<\/strong>, du hast einen neuen Server unter derselben IP-Adresse, oder ein Hoster hat die Maschine getauscht. Dann hat sich der Schl\u00fcssel legitim ge\u00e4ndert und du kannst den alten Eintrag gefahrlos entfernen.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">L\u00f6sung: Den alten Host-Schl\u00fcssel entfernen<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Entferne den veralteten Eintrag gezielt mit <code>ssh-keygen<\/code>. Ersetze <code>server<\/code> durch den Hostnamen oder die IP:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#24292e\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#e1e4e8;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>ssh-keygen -R server<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">ssh-keygen<\/span><span style=\"color: #79B8FF\"> -R<\/span><span style=\"color: #9ECBFF\"> server<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Beim n\u00e4chsten Verbinden fragt SSH erneut, ob du dem (neuen) Schl\u00fcssel vertraust \u2013 best\u00e4tige mit <code>yes<\/code>. Die Warnung nennt dir auch die genaue Zeile in der <code>known_hosts<\/code>, falls du sie manuell l\u00f6schen willst.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Wann du vorsichtig sein solltest<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hat sich am Server <strong>nichts<\/strong> ge\u00e4ndert \u2013 keine Neuinstallation, kein Serverwechsel \u2013 dann nimm die Warnung ernst. In seltenen F\u00e4llen kann sie auf einen Angriff hindeuten, bei dem sich jemand zwischen dich und den Server schaltet. Pr\u00fcfe im Zweifel den Fingerabdruck \u00fcber einen zweiten, vertrauensw\u00fcrdigen Weg.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">H\u00e4ufige Fragen<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Ist die Warnung ein Zeichen f\u00fcr einen Hackerangriff?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Meist nicht \u2013 \u00fcblicher ist eine Neuinstallation oder ein Serverwechsel. Nur wenn sich am Server nachweislich nichts ge\u00e4ndert hat, solltest du die Warnung als m\u00f6glichen Angriff ernst nehmen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kann ich die Pr\u00fcfung einfach abschalten?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Davon raten wir ab. Die Host-Key-Pr\u00fcfung sch\u00fctzt dich vor Angriffen. Entferne lieber gezielt den veralteten Eintrag mit <code>ssh-keygen -R<\/code>, statt die Sicherheitsfunktion zu deaktivieren.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Wo finde ich die gespeicherten Schl\u00fcssel?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In der Datei <code>~\/.ssh\/known_hosts<\/code> auf deinem lokalen Rechner. Dort steht pro Server eine Zeile mit dessen Host-Schl\u00fcssel.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Fazit<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Die Warnung \u201eREMOTE HOST IDENTIFICATION HAS CHANGED&#8221; bedeutet, dass sich der Server-Schl\u00fcssel ge\u00e4ndert hat \u2013 meist wegen einer Neuinstallation. Entferne den alten Eintrag mit <code>ssh-keygen -R server<\/code> und verbinde dich neu. Nur wenn sich am Server nichts ge\u00e4ndert hat, ist Vorsicht geboten.<\/p>\n<script type=\"text\/plain\" data-tcf=\"waiting-for-consent\" data-id=\"4799\" data-bid=\"2\" data-placement=\"4800\">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<\/script>","protected":false},"excerpt":{"rendered":"<p>SSH-Warnung \u201eREMOTE HOST IDENTIFICATION HAS CHANGED\u201c beheben: Was der ge\u00e4nderte Host-Schl\u00fcssel bedeutet und wie du den alten Eintrag entfernst.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_affilinode_tracking":"","_affilinode_autolink_off":false,"_affilinode_rating":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[9],"tags":[],"class_list":["post-5048","post","type-post","status-publish","format-standard","hentry","category-linux"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"Tobias","author_link":"https:\/\/netguide.io\/linux\/author\/tobias-pries\/"},"uagb_comment_info":0,"uagb_excerpt":"SSH-Warnung \u201eREMOTE HOST IDENTIFICATION HAS CHANGED\u201c beheben: Was der ge\u00e4nderte Host-Schl\u00fcssel bedeutet und wie du den alten Eintrag 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