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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:
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Or for longer, use three backticks above and below the code snippet:
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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 (20.0.0.3):
Operating system and version (Debian 10):
Apache or nginx version (Nginx 1.14.2:
PHP version (7.3):
The issue you are facing:
When I access nextcloud in the WebUI: 504 Gateway Time-out - nginx
Is this the first time you’ve seen this error? (Y)
Steps to replicate it:
- After accidentaly running a chown/chgrp command for the whole nextcloud folder, I cannot access Nextclud in the browser anymore
2.
My directory looks like this now, everything is owned by www-data
504 Gateway Time-out
nginx
The output of your Nextcloud log in Admin > Logging:
{"reqId":"PlXZvbHL2u8JIEgSU4f6","level":2,"time":"2020-12-05T00:13:32+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')","userAg$
{"reqId":"FRbf3FIiunPNkKLZ8tzp","level":2,"time":"2020-12-05T00:14:17+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/login","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')","u$
{"reqId":"kFEw2i9WKOt5Sadg5vzY","level":2,"time":"2020-12-05T00:18:49+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"POST","url":"/nextcloud/login","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')","$
{"reqId":"zIwjInJUUmc0kzq5ICMy","level":2,"time":"2020-12-05T00:20:21+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/apps/files/?dir=/Haubaum&fileid=568050","message":"Login failed: 'lynxtita$
{"reqId":"hZ4CmuDz6cKLja2z3SOk","level":2,"time":"2020-12-05T00:20:25+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/login?redirect_url=/nextcloud/apps/files/?dir%3D/Haubaum%26fileid%3D568050$
{"reqId":"g42yT28xJ8DB7FUBBHo8","level":2,"time":"2020-12-05T00:21:10+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/csrftoken","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')$
{"reqId":"BTgb5LBXlof76uzYHFMt","level":2,"time":"2020-12-05T00:23:06+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')","userAg$
{"reqId":"y4SzIgyZkKczlctflOYa","level":2,"time":"2020-12-05T00:42:35+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')","userAg$
{"reqId":"XhrsxiZwp1K6uUUMSWZw","level":2,"time":"2020-12-05T00:47:03+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')","userAg$
{"reqId":"FNIRakPcX43mP0NmbvI7","level":2,"time":"2020-12-05T00:47:48+00:00","remoteAddr":"154.13.1.27","user":"--","app":"core","method":"GET","url":"/nextcloud/login","message":"Login failed: 'lynxtitan' (Remote IP: '154.13.1.27')","u$
{"reqId":"105smDdoLRmaRnVG7Y2u","level":4,"time":"2020-12-05T00:59:03+00:00","remoteAddr":"212.17.88.59","user":"avgeist","app":"webdav","method":"PROPFIND","url":"/nextcloud/remote.php/webdav/Haubaum/","message":{"Exception":"Sabre\\DA$
The output of your Apache/nginx/system log in /var/log/____:
2020/12/05 11:35:51 [error] 357152#357152: *12206 upstream timed out (110: Connection timed out) while reading response header from upstream, client: , server: hcoe.club, request: "PROPFIND /nextcloud/remote.php/webdav/Docum$
2020/12/05 11:43:50 [error] 357152#357152: send() failed (111: Connection refused) while resolving, resolver: 127.0.0.1:53
2020/12/05 11:49:36 [error] 357152#357152: send() failed (111: Connection refused) while resolving, resolver: 127.0.0.1:53
2020/12/05 11:50:56 [error] 357152#357152: *12544 upstream timed out (110: Connection timed out) while reading response header from upstream, client: , server: hcoe.club, request: "GET /nextcloud/login?redirect_url=/nextcloud$
2020/12/05 11:56:02 [error] 357152#357152: send() failed (111: Connection refused) while resolving, resolver: 127.0.0.1:53
2020/12/05 12:03:38 [error] 357152#357152: send() failed (111: Connection refused) while resolving, resolver: 127.0.0.1:53
2020/12/05 12:04:38 [error] 357152#357152: *12795 upstream timed out (110: Connection timed out) while reading response header from upstream, client:, server: hcoe.club, request: "GET /nextcloud/login?redirect_url=/nextcloud$
2020/12/05 12:19:30 [error] 357152#357152: send() failed (111: Connection refused) while resolving, resolver: 127.0.0.1:53
2020/12/05 12:35:02 [error] 357152#357152: send() failed (111: Connection refused) while resolving, resolver: 127.0.0.1:53
