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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
{"reqId":"BUFELR3RUub7wUwZsmte","level":3,"time":"2020-03-28T10:51:43+00:00","remoteAddr":"192.168.2.10","user":"admin","app":"index","method":"GET","url":"/index.php/apps/files/?dir=/","message":{"Exception":"Exception","Message":"Error 47 interacting with memcached : SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY","Code":0,"Trace":[{"file":"/var/www/dl.ifnor/lib/private/Memcache/Memcached.php","line":117,"function":"verifyReturnCode","class":"OC\\Memcache\\Memcached","type":"->","args":[]},{"file":"/var/www/dl.ifnor/lib/private/URLGenerator.php","line":230,"function":"set","class":"OC\\Memcache\\Memcached","type":"->","args":["core-actions/delete.svg","/core/img/actions/delete.svg"]},{"file":"/var/www/dl.ifnor/lib/private/legacy/template/functions.php","line":237,"function":"imagePath","class":"OC\\URLGenerator","type":"->","args":["core","actions/delete.svg"]},{"file":"/var/www/dl.ifnor/lib/public/Template.php","line":48,"function":"image_path","args":["core","actions/delete.svg"]},{"file":"/var/www/dl.ifnor/apps/files/templates/simplelist.php","line":32,"function":"image_path","class":"OCP\\Template","type":"::","args":["core","actions/delete.svg"]},{"file":"/var/www/dl.ifnor/lib/private/Template/Base.php","line":179,"args":["/var/www/dl.ifnor/apps/files/templates/simplelist.php"],"function":"include"},{"file":"/var/www/dl.ifnor/lib/private/Template/Base.php","line":151,"function":"load","class":"OC\\Template\\Base","type":"->","args":["/var/www/dl.ifnor/apps/files/templates/simplelist.php",null]},{"file":"/var/www/dl.ifnor/lib/private/legacy/template.php","line":181,"function":"fetchPage","class":"OC\\Template\\Base","type":"->","args":[null]},{"file":"/var/www/dl.ifnor/lib/private/Template/Base.php","line":132,"function":"fetchPage","class":"OC_Template","type":"->","args":[]},{"file":"/var/www/dl.ifnor/apps/files/simplelist.php","line":37,"function":"printPage","class":"OC\\Template\\Base","type":"->","args":[]},{"file":"/var/www/dl.ifnor/apps/files/lib/Controller/ViewController.php","line":121,"args":["/var/www/dl.ifnor/apps/files/simplelist.php"],"function":"include"},{"file":"/var/www/dl.ifnor/apps/files/lib/Controller/ViewController.php","line":259,"function":"renderScript","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":["files","simplelist.php"]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/Http/Dispatcher.php","line":170,"function":"index","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":["/","",null,false]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/Http/Dispatcher.php","line":99,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/App.php","line":125,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/Routing/RouteActionHandler.php","line":47,"function":"main","class":"OC\\AppFramework\\App","type":"::","args":["OCA\\Files\\Controller\\ViewController","index",{"__class__":"OC\\AppFramework\\DependencyInjection\\DIContainer"},{"_route":"files.view.index"}]},{"function":"__invoke","class":"OC\\AppFramework\\Routing\\RouteActionHandler","type":"->","args":[{"_route":"files.view.index"}]},{"file":"/var/www/dl.ifnor/lib/private/Route/Router.php","line":299,"function":"call_user_func","args":[{"__class__":"OC\\AppFramework\\Routing\\RouteActionHandler"},{"_route":"files.view.index"}]},{"file":"/var/www/dl.ifnor/lib/base.php","line":1008,"function":"match","class":"OC\\Route\\Router","type":"->","args":["/apps/files/"]},{"file":"/var/www/dl.ifnor/index.php","line":38,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/var/www/dl.ifnor/lib/private/Memcache/Memcached.php","Line":225,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1 Safari/605.1.15","version":"18.0.3.0"}
{"reqId":"BUFELR3RUub7wUwZsmte","level":3,"time":"2020-03-28T10:51:43+00:00","remoteAddr":"192.168.2.10","user":"admin","app":"core","method":"GET","url":"/index.php/apps/files/?dir=/","message":{"Exception":"Exception","Message":"Error 47 interacting with memcached : SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY","Code":0,"Trace":[{"file":"/var/www/dl.ifnor/lib/private/Memcache/Memcached.php","line":117,"function":"verifyReturnCode","class":"OC\\Memcache\\Memcached","type":"->","args":[]},{"file":"/var/www/dl.ifnor/lib/private/URLGenerator.php","line":230,"function":"set","class":"OC\\Memcache\\Memcached","type":"->","args":["core-actions/delete.svg","/core/img/actions/delete.svg"]},{"file":"/var/www/dl.ifnor/lib/private/legacy/template/functions.php","line":237,"function":"imagePath","class":"OC\\URLGenerator","type":"->","args":["core","actions/delete.svg"]},{"file":"/var/www/dl.ifnor/lib/public/Template.php","line":48,"function":"image_path","args":["core","actions/delete.svg"]},{"file":"/var/www/dl.ifnor/apps/files/templates/simplelist.php","line":32,"function":"image_path","class":"OCP\\Template","type":"::","args":["core","actions/delete.svg"]},{"file":"/var/www/dl.ifnor/lib/private/Template/Base.php","line":179,"args":["/var/www/dl.ifnor/apps/files/templates/simplelist.php"],"function":"include"},{"file":"/var/www/dl.ifnor/lib/private/Template/Base.php","line":151,"function":"load","class":"OC\\Template\\Base","type":"->","args":["/var/www/dl.ifnor/apps/files/templates/simplelist.php",null]},{"file":"/var/www/dl.ifnor/lib/private/legacy/template.php","line":181,"function":"fetchPage","class":"OC\\Template\\Base","type":"->","args":[null]},{"file":"/var/www/dl.ifnor/lib/private/Template/Base.php","line":132,"function":"fetchPage","class":"OC_Template","type":"->","args":[]},{"file":"/var/www/dl.ifnor/apps/files/simplelist.php","line":37,"function":"printPage","class":"OC\\Template\\Base","type":"->","args":[]},{"file":"/var/www/dl.ifnor/apps/files/lib/Controller/ViewController.php","line":121,"args":["/var/www/dl.ifnor/apps/files/simplelist.php"],"function":"include"},{"file":"/var/www/dl.ifnor/apps/files/lib/Controller/ViewController.php","line":259,"function":"renderScript","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":["files","simplelist.php"]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/Http/Dispatcher.php","line":170,"function":"index","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":["/","",null,false]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/Http/Dispatcher.php","line":99,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/App.php","line":125,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/var/www/dl.ifnor/lib/private/AppFramework/Routing/RouteActionHandler.php","line":47,"function":"main","class":"OC\\AppFramework\\App","type":"::","args":["OCA\\Files\\Controller\\ViewController","index",{"__class__":"OC\\AppFramework\\DependencyInjection\\DIContainer"},{"_route":"files.view.index"}]},{"function":"__invoke","class":"OC\\AppFramework\\Routing\\RouteActionHandler","type":"->","args":[{"_route":"files.view.index"}]},{"file":"/var/www/dl.ifnor/lib/private/Route/Router.php","line":299,"function":"call_user_func","args":[{"__class__":"OC\\AppFramework\\Routing\\RouteActionHandler"},{"_route":"files.view.index"}]},{"file":"/var/www/dl.ifnor/lib/base.php","line":1008,"function":"match","class":"OC\\Route\\Router","type":"->","args":["/apps/files/"]},{"file":"/var/www/dl.ifnor/index.php","line":38,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/var/www/dl.ifnor/lib/private/Memcache/Memcached.php","Line":225,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1 Safari/605.1.15","version":"18.0.3.0"}
{"reqId":"BUFELR3RUub7wUwZsmte","level":3,"time":"2020-03-28T10:51:43+00:00","remoteAddr":"192.168.2.10","user":"admin","app":"core","method":"GET","url":"/index.php/apps/files/?dir=/","message":{"Exception":"Exception","Message":"Error 47 interacting with memcached : SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY","Code":0,"Trace":[{"file":"/var/www/dl.ifnor/lib/private/Memcache/Memcached.php","line":117,"function":"verifyReturnCode","class":"OC\\Memcache\\Memcached","type":"->","args":[]},{"file":"/var/www/dl.ifnor/lib/private/Template/JSCombiner.php","line":199,"function":"set","class":"OC\\Memcache\\Memcached","type":"->","args":["core-merged-template-prepend.js.deps","{\"\\/var\\/www\\/dl.ifnor\\/core\\/js\\/merged-template-prepend.json\":1585392378,\"\\/var\\/www\\/dl.ifnor\\/core\\/js\\/mimetype.js\":1585392378,\"\\/var\\/www\\/dl.ifnor\\/core\\/js\\/mimetypelist.js\":1585392378,\"\\/var\\/www\\/dl.ifnor\\/core\\/js\\/select2-toggleselect.js\":1585392378}"]},{"file":"/var/www/dl.ifnor/lib/private/Template/JSCombiner.php","line":105,"function":"cache","class":"OC\\Template\\JSCombiner","type":"->","args":["/var/www/dl.ifnor/core/js","merged-template-prepend.js",{"__class__":"OC\\Files\\SimpleFS\\SimpleFolder"}]},{"file":"/var/www/dl.ifnor/lib/private/Template/JSResourceLocator.php","line":115,"function":"process","class":"OC\\Template\\JSCombiner","type":"->","args":["/var/www/dl.ifnor","core/js/merged-template-prepend.json","core"]},{"file":"/var/www/dl.ifnor/lib/private/Template/JSResourceLocator.php","line":71,"function":"cacheAndAppendCombineJsonIfExist","class":"OC\\Template\\JSResourceLocator","type":"->","args":["/var/www/dl.ifnor","core/js/merged-template-prepend.json"]},{"file":"/var/www/dl.ifnor/lib/private/Template/ResourceLocator.php","line":78,"function":"doFind","class":"OC\\Template\\JSResourceLocator","type":"->","args":["js/merged-template-prepend"]},{"file":"/var/www/dl.ifnor/lib/private/TemplateLayout.php","line":346,"function":"find","class":"OC\\Template\\ResourceLocator","type":"->","args":[["core/js/dist/main","js/merged-template-prepend","search/js/search","core/l10n/de","files_sharing/l10n/de","files_sharing/js/dist/main","notifications/l10n/de","notifications/js/notifications","search/l10n/de","search/js/searchprovider","js/files/fileinfo","js/files/client","files/l10n/de","files/js/merged-index"]]},{"file":"/var/www/dl.ifnor/lib/private/TemplateLayout.php","line":174,"function":"findJavascriptFiles","class":"OC\\TemplateLayout","type":"::","args":[["core/js/dist/main","js/merged-template-prepend","search/js/search","core/l10n/de","files_sharing/l10n/de","files_sharing/js/dist/main","notifications/l10n/de","notifications/js/notifications","search/l10n/de","search/js/searchprovider","js/files/fileinfo","js/files/client","files/l10n/de","files/js/merged-index"]]},{"file":"/var/www/dl.ifnor/lib/private/legacy/template.php","line":184,"function":"__construct","class":"OC\\TemplateLayout","type":"->","args":["error",""]},{"file":"/var/www/dl.ifnor/lib/private/Template/Base.php","line":132,"function":"fetchPage","class":"OC_Template","type":"->","args":[]},{"file":"/var/www/dl.ifnor/lib/private/legacy/template.php","line":333,"function":"printPage","class":"OC\\Template\\Base","type":"->","args":[]},{"file":"/var/www/dl.ifnor/index.php","line":65,"function":"printExceptionErrorPage","class":"OC_Template","type":"::","args":[{"__class__":"Exception"},500]}],"File":"/var/www/dl.ifnor/lib/private/Memcache/Memcached.php","Line":225,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1 Safari/605.1.15","version":"18.0.3.0"}
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 18.0.3
Operating system and version (eg, Ubuntu 17.04): Debian GNU/Linux 10
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38 (Debian)
PHP version (eg, 7.1): PHP 7.3.14-1~deb10u1
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- We have a Memcache-Server configured (old one)
- We have edited the IP in the config.php to the new Memcache-Server
- We got the error
The output of your Nextcloud log in Admin > Logging:
Can't do that...
Internal Server Error
The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ocn7gvh5edc9',
'passwordsalt' => '7iKXmqGbh3p1IRDjZ4s+4wTolJFU4W',
'secret' => 'fQjLng99AOyuutwGnCeoZMtj3D4CbEnKWnITLRoU7mV3YmvP',
'trusted_domains' =>
array (
0 => 'domain.com',
),
'trusted_proxies' =>
array (
0 => '192.168.254.16',
1 => '192.168.254.17',
),
'datadirectory' => '/var/www/dl.ifnor/data',
'dbtype' => 'mysql',
'version' => '18.0.3.0',
'overwrite.cli.url' => 'https://domain.com',
'dbname' => 'ifnorre_ncdl',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'ifncdl',
'dbpassword' => 'CONFIDENTIAL',
'installed' => true,
'maintenance' => false,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'noreply',
'mail_domain' => 'domain.com',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'plesk51.ifnormatik.com',
'mail_smtpport' => '25',
'mail_smtpname' => 'noreply@domain.com',
'mail_smtppassword' => 'CONFIDENTIAL',
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Memcached',
'memcached_servers' =>
array (
0 =>
array (
0 => '10.98.0.7',
1 => 11211,
),
),
'theme' => '',
'loglevel' => 2,
'updater.secret' => 'CONFIDENTIAL',
);
The output of your Apache/nginx/system log in /var/log/____:
There is nothing...