Nextcloud client for windows crashes while connecting to nextcloud

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Nextcloud version (eg, 12.0.2): NextCloudPi 16.0.5 / nextcloud version 16.0.5.1
Operating system and version (eg, Ubuntu 17.04): Debian 10
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38 (Debian)
PHP version (eg, 7.1): PHP 7.3.9-1~deb10u1 (cli) (built: Sep 18 2019 10:33:23) ( NTS )

The issue you are facing:
Nextlcoud client crashes when trying to connect to server.

I tried to proper reinstall the client software, but when I uninstall and install again, the seetings from the old installation are still remained.

Is this the first time you’ve seen this error? (Y/N): N

Steps to replicate it:

  1. Install nextcloud desktop client for windows.
  2. Add new user, put in domain
  3. Open browser as suggested to connect the client to nextcloud
  4. Nothing happens, after ~30 sec. Nextcloud crashes without any message.

The output of your Nextcloud log in Admin > Logging:

{"reqId":"nA7odZsiyouUDApHiyJp","level":3,"time":"2019-10-26T09:15:02+00:00","remoteAddr":"","user":"--","app":"cron","method":"","url":"--","message":{"Exception":"Exception","Message":"Not installed","Code":0,"Trace":[{"file":"\/var\/www\/nextcloud\/lib\/base.php","line":646,"function":"checkInstalled","class":"OC","type":"::","args":[]},{"file":"\/var\/www\/nextcloud\/lib\/base.php","line":1056,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/var\/www\/nextcloud\/cron.php","line":41,"args":["\/var\/www\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/var\/www\/nextcloud\/lib\/base.php","Line":277,"CustomMessage":"--"},"userAgent":"--","version":""}
{"reqId":"XbQUsHy7zZAFqIKKTVyGegAABwA","level":2,"time":"2019-10-26T09:41:04+00:00","remoteAddr":"192.168.1.22","user":"--","app":"core","method":"POST","url":"\/index.php\/login","message":"Login failed: 'pi' (Remote IP: '192.168.1.22')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbQUt3y7zZAFqIKKTVyGfAAACwA","level":2,"time":"2019-10-26T09:41:11+00:00","remoteAddr":"192.168.1.22","user":"--","app":"core","method":"POST","url":"\/index.php\/login?user=pi","message":"Login failed: 'pi' (Remote IP: '192.168.1.22')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbQU2ILvrVkJ9N3ckBkkqAAAUwY","level":2,"time":"2019-10-26T09:41:46+00:00","remoteAddr":"192.168.1.22","user":"--","app":"core","method":"POST","url":"\/index.php\/login?user=pi","message":"Login failed: 'ncp' (Remote IP: '192.168.1.22')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbQU3YLvrVkJ9N3ckBkkqgAAVQY","level":2,"time":"2019-10-26T09:41:52+00:00","remoteAddr":"192.168.1.22","user":"--","app":"core","method":"POST","url":"\/index.php\/login?user=ncp","message":"Login failed: 'ncp' (Remote IP: '192.168.1.22')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbQVZILvrVkJ9N3ckBkksgAARgc","level":2,"time":"2019-10-26T09:44:04+00:00","remoteAddr":"192.168.1.22","user":"ncp","app":"ocs_api","method":"POST","url":"\/ocs\/v2.php\/cloud\/users","message":{"Exception":"OC\\HintException","Message":"Password is among the 1,000,000 most common ones. Please make it unique.","Code":0,"Trace":[{"file":"\/var\/www\/nextcloud\/apps\/password_policy\/lib\/PasswordValidator.php","line":64,"function":"checkCommonPasswords","class":"OCA\\Password_Policy\\PasswordValidator","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"\/var\/www\/nextcloud\/apps\/password_policy\/lib\/AppInfo\/Application.php","line":49,"function":"validate","class":"OCA\\Password_Policy\\PasswordValidator","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"\/var\/www\/nextcloud\/3rdparty\/symfony\/event-dispatcher\/EventDispatcher.php","line":212,"function":"OCA\\Password_Policy\\AppInfo\\{closure}","class":"OCA\\Password_Policy\\AppInfo\\Application","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"\/var\/www\/nextcloud\/3rdparty\/symfony\/event-dispatcher\/EventDispatcher.php","line":44,"function":"doDispatch","class":"Symfony\\Component\\EventDispatcher\\EventDispatcher","type":"->","args":[[{"__class__":"Closure"}],"*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},{"file":"\/var\/www\/nextcloud\/lib\/private\/User\/Database.php","line":132,"function":"dispatch","class":"Symfony\\Component\\EventDispatcher\\EventDispatcher","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},{"file":"\/var\/www\/nextcloud\/lib\/private\/User\/Manager.php","line":347,"function":"createUser","class":"OC\\User\\Database","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},{"file":"\/var\/www\/nextcloud\/lib\/private\/User\/Manager.php","line":301,"function":"createUserFromBackend","class":"OC\\User\\Manager","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***",{"__class__":"OC\\User\\Database"}]},{"file":"\/var\/www\/nextcloud\/apps\/provisioning_api\/lib\/Controller\/UsersController.php","line":279,"function":"createUser","class":"OC\\User\\Manager","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},{"file":"\/var\/www\/nextcloud\/lib\/private\/AppFramework\/Http\/Dispatcher.php","line":166,"function":"addUser","class":"OCA\\Provisioning_API\\Controller\\UsersController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"\/var\/www\/nextcloud\/lib\/private\/AppFramework\/Http\/Dispatcher.php","line":99,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Provisioning_API\\Controller\\UsersController"},"addUser"]},{"file":"\/var\/www\/nextcloud\/lib\/private\/AppFramework\/App.php","line":126,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Provisioning_API\\Controller\\UsersController"},"addUser"]},{"file":"\/var\/www\/nextcloud\/lib\/private\/AppFramework\/Routing\/RouteActionHandler.php","line":47,"function":"main","class":"OC\\AppFramework\\App","type":"::","args":["OCA\\Provisioning_API\\Controller\\UsersController","addUser",{"__class__":"OC\\AppFramework\\DependencyInjection\\DIContainer"},{"_route":"ocs.provisioning_api.Users.addUser"}]},{"function":"__invoke","class":"OC\\AppFramework\\Routing\\RouteActionHandler","type":"->","args":[{"_route":"ocs.provisioning_api.Users.addUser"}]},{"file":"\/var\/www\/nextcloud\/lib\/private\/Route\/Router.php","line":297,"function":"call_user_func","args":[{"__class__":"OC\\AppFramework\\Routing\\RouteActionHandler"},{"_route":"ocs.provisioning_api.Users.addUser"}]},{"file":"\/var\/www\/nextcloud\/ocs\/v1.php","line":82,"function":"match","class":"OC\\Route\\Router","type":"->","args":["\/ocsapp\/cloud\/users"]},{"file":"\/var\/www\/nextcloud\/ocs\/v2.php","line":24,"args":["\/var\/www\/nextcloud\/ocs\/v1.php"],"function":"require_once"}],"File":"\/var\/www\/nextcloud\/apps\/password_policy\/lib\/PasswordValidator.php","Line":162,"Hint":"Das Passwort ist unter den 1.000.000 h\u00e4ufigsten Passw\u00f6rtern. Bitte w\u00e4hle ein anderes.","CustomMessage":"Failed addUser attempt with hint exception."},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbRE9AT45joHeOJkNt6GiwAACwk","level":2,"time":"2019-10-26T13:07:01+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login","message":"Login failed: 'Simon' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbRSIwT45joHeOJkNt6HZQAAABE","level":2,"time":"2019-10-26T14:03:15+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.5.2git (build 20190319) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRSIwT45joHeOJkNt6HZgAAABM","level":2,"time":"2019-10-26T14:03:16+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.5.2git (build 20190319) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRT9AT45joHeOJkNt6HiAAABBc","level":2,"time":"2019-10-26T14:11:02+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login?redirect_url=\/index.php\/login\/flow\/grant%3FclientIdentifier%3D%26stateToken%3Dc9s8YU7iIQ1DDKwO8JHHCbUIerZ8dULiDzUcVczYND6vYguQYJhlYWL2uFjKERe3","message":"Login failed: 'Simon' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.5.2git (build 20190319) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRVBkyiPViuPK6vI@zDzgAAAIM","level":2,"time":"2019-10-26T14:15:34+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.5.2git (build 20190319) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRVBkyiPViuPK6vI@zDzwAAAIE","level":2,"time":"2019-10-26T14:15:35+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.5.2git (build 20190319) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRVu0yiPViuPK6vI@zD1QAAkAI","level":2,"time":"2019-10-26T14:18:37+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRVvUyiPViuPK6vI@zD1gAAkQI","level":2,"time":"2019-10-26T14:18:40+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRVwgT45joHeOJkNt6IGAAADxM","level":2,"time":"2019-10-26T14:18:48+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRVxgT45joHeOJkNt6IGQAADwc","level":2,"time":"2019-10-26T14:18:53+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRV0UyiPViuPK6vI@zD3gAAlwI","level":3,"time":"2019-10-26T14:18:57+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbRV0gT45joHeOJkNt6IGwAAERM","level":2,"time":"2019-10-26T14:19:23+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRV6kyiPViuPK6vI@zD5wAAhwg","level":3,"time":"2019-10-26T14:19:24+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbRV0gT45joHeOJkNt6IGgAAEQc","level":2,"time":"2019-10-26T14:19:48+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRWL0yiPViuPK6vI@zD9AAAgAI","level":3,"time":"2019-10-26T14:20:32+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbRWUkyiPViuPK6vI@zEAAAAjBA","level":3,"time":"2019-10-26T14:21:07+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbRWyUyiPViuPK6vI@zEEAAAgQg","level":3,"time":"2019-10-26T14:23:06+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbRWskyiPViuPK6vI@zEBAAAmBA","level":2,"time":"2019-10-26T14:23:07+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRW10yiPViuPK6vI@zEEgAAjRA","level":2,"time":"2019-10-26T14:23:44+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRW4UyiPViuPK6vI@zEFQAAjAA","level":2,"time":"2019-10-26T14:23:54+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRW6EyiPViuPK6vI@zEFgAAjAc","level":2,"time":"2019-10-26T14:24:01+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbRW6kyiPViuPK6vI@zEFwAAjAI","level":2,"time":"2019-10-26T14:24:10+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSCcEyiPViuPK6vI@zENQAAlgc","level":3,"time":"2019-10-26T17:29:20+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbSCXUyiPViuPK6vI@zEJAAAhwA","level":2,"time":"2019-10-26T17:29:26+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSCgkyiPViuPK6vI@zEYQAAjwA","level":2,"time":"2019-10-26T17:30:03+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSDdEyiPViuPK6vI@zEfgAAgwc","level":4,"time":"2019-10-26T17:33:40+00:00","remoteAddr":"192.168.1.22","user":"ncp","app":"ocs_api","method":"POST","url":"\/ocs\/v2.php\/cloud\/users","message":"Failed addUser attempt: User already exists.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbSDlwT45joHeOJkNt6IhAAADAY","level":2,"time":"2019-10-26T17:34:42+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSDvUyiPViuPK6vI@zEgwAAigc","level":2,"time":"2019-10-26T17:35:20+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSEl0yiPViuPK6vI@zEhAAAiwc","level":2,"time":"2019-10-26T17:38:57+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSEq0yiPViuPK6vI@zEhQAAiwA","level":2,"time":"2019-10-26T17:39:18+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSEsUyiPViuPK6vI@zEhgAAiwg","level":2,"time":"2019-10-26T17:39:23+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"GET","url":"\/ocs\/v2.php\/core\/navigation\/apps?absolute=true&format=json","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbSNhQT45joHeOJkNt6IrgAAAAU","level":2,"time":"2019-10-26T18:17:03+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"HEAD","url":"\/remote.php\/webdav\/","message":"Login failed: '' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Android) Nextcloud-android\/3.8.1","version":"16.0.5.1"}
{"reqId":"XbVHINOBhej8zLnJv@txIgAAABA","level":2,"time":"2019-10-27T07:28:34+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVHNdOBhej8zLnJv@txIwAADxA","level":2,"time":"2019-10-27T07:28:55+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVHv9OBhej8zLnJv@txJgAAAxA","level":2,"time":"2019-10-27T07:31:13+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVHx9OBhej8zLnJv@txQAAADA8","level":2,"time":"2019-10-27T07:31:21+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVHydOBhej8zLnJv@txQgAAEgs","level":3,"time":"2019-10-27T07:31:21+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbVHztOBhej8zLnJv@txQwAADgs","level":2,"time":"2019-10-27T07:31:29+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVH5tOBhej8zLnJv@txTQAADw8","level":2,"time":"2019-10-27T07:31:52+00:00","remoteAddr":"192.168.1.22","user":"--","app":"core","method":"POST","url":"\/index.php\/login","message":"Login failed: 'pi' (Remote IP: '192.168.1.22')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbVH79OBhej8zLnJv@txTwAABw8","level":2,"time":"2019-10-27T07:32:01+00:00","remoteAddr":"192.168.1.22","user":"--","app":"core","method":"POST","url":"\/index.php\/login?user=pi","message":"Login failed: 'pi' (Remote IP: '192.168.1.22')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbVH9NOBhej8zLnJv@txUQAAAw8","level":2,"time":"2019-10-27T07:32:06+00:00","remoteAddr":"192.168.1.22","user":"--","app":"core","method":"POST","url":"\/index.php\/login?user=pi","message":"Login failed: 'pi' (Remote IP: '192.168.1.22')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbVIL9OBhej8zLnJv@txnAAABBA","level":2,"time":"2019-10-27T07:33:08+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVIONOBhej8zLnJv@txqAAAARA","level":3,"time":"2019-10-27T07:33:13+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbVIOtOBhej8zLnJv@txqQAACRA","level":2,"time":"2019-10-27T07:33:22+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVIOtOBhej8zLnJv@txqgAACQA","level":2,"time":"2019-10-27T07:33:28+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVIY9OBhej8zLnJv@tx4QAADQk","level":3,"time":"2019-10-27T07:33:56+00:00","remoteAddr":"91.51.73.49","user":"Simon","app":"PHP","method":"POST","url":"\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.5.1"}
{"reqId":"XbVIUtOBhej8zLnJv@txsAAADxA","level":2,"time":"2019-10-27T07:34:05+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}
{"reqId":"XbVIUtOBhej8zLnJv@txrwAADwA","level":2,"time":"2019-10-27T07:34:30+00:00","remoteAddr":"91.51.73.49","user":"--","app":"core","method":"POST","url":"\/index.php\/login\/v2\/poll","message":"Login failed: 'pi' (Remote IP: '91.51.73.49')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.0stable-Win64 (build 20190927) (Nextcloud)","version":"16.0.5.1"}

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'passwordsalt' => 'censored',
  'secret' => 'censored',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    11 => '2003:d1:71e:5a00:fd00:3a9d:43fc:9bb9',
    1 => '192.168.1.35',
    5 => 'nextcloudpi.local',
    7 => 'nextcloudpi',
    8 => 'nextcloudpi.lan',
    4 => '*censored*',
    20 => '*censored*',
    21 => '*censored*',
  ),
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '16.0.5.1',
  'overwrite.cli.url' => '**censored**',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'ncadmin',
  'dbpassword' => '*censored*',
  'installed' => true,

The output of your Apache/nginx/system log in /var/log/____:

input of nc-error.log:

[Sat Oct 26 11:13:56.688746 2019] [ssl:warn] [pid 18934:tid 3083093440] AH01909: localhost:443:0 server certificate does NOT include an ID which mat$
[Sat Oct 26 11:13:56.689019 2019] [ssl:error] [pid 18934:tid 3083093440] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subjec$
[Sat Oct 26 11:13:56.689031 2019] [ssl:error] [pid 18934:tid 3083093440] AH02604: Unable to configure certificate localhost:443:0 for stapling
[Sat Oct 26 11:13:56.700997 2019] [ssl:warn] [pid 18935:tid 3083093440] AH01909: localhost:443:0 server certificate does NOT include an ID which mat$
[Sat Oct 26 11:13:56.701180 2019] [ssl:error] [pid 18935:tid 3083093440] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subjec$
[Sat Oct 26 11:13:56.701191 2019] [ssl:error] [pid 18935:tid 3083093440] AH02604: Unable to configure certificate localhost:443:0 for stapling
[Sat Oct 26 11:38:17.713160 2019] [ssl:warn] [pid 18935:tid 3083093440] AH01909: localhost:443:0 server certificate does NOT include an ID which mat$
[Sat Oct 26 11:38:17.713756 2019] [ssl:error] [pid 18935:tid 3083093440] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subjec$
[Sat Oct 26 11:38:17.713779 2019] [ssl:error] [pid 18935:tid 3083093440] AH02604: Unable to configure certificate localhost:443:0 for stapling