Ich habe dieselbe Fehlermeldung seit Nextcloud 32.0. Bei mir wird sie verursacht, wenn ein Client auf caldav/carddav zugreifen möchte während Nextcloud sich im Wartungsmodus befindet.
{"reqId":"4yS869z198evyX4KhI1J","level":3,"time":"2025-10-21T11:58:31+02:00","remoteAddr":"1.2.3.4","user":"--","app":"no app in context","method":"REPORT","url":"/nextcloud/remote.php/dav/addressbooks/users/<USERNAME>/contacts/","message":"Uncaught exception","userAgent":"iOS/26.0.1 (23A355) dataaccessd/1.0","version":"32.0.0.13","exception":{"Exception":"OCA\\DAV\\Exception\\ServerMaintenanceMode","Message":"Das System befindet sich im Wartungsmodus.","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"checkMaintenanceMode","class":"OCA\\DAV\\Connector\\Sabre\\MaintenancePlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":456,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Server.php","line":211,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":424,"function":"start","class":"OCA\\DAV\\Connector\\Sabre\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":22,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":151,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/MaintenancePlugin.php","Line":65,"message":"Uncaught exception","exception":{},"CustomMessage":"Uncaught exception"}}
Ich habe ein Github issue eröffnet: [Bug]: Nextcloud reports errors with carddav/caldav requests in maintenance mode · Issue #55894 · nextcloud/server · GitHub