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Sorry to hear you’re facing problems 
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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:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
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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 (eg, 20.0.5): 22.1.0.1
Operating system and version (eg, Ubuntu 20.04): Unraid
Apache or nginx version (eg, Apache 2.4.25): NGINX
PHP version (eg, 7.4): 7.4.23
The issue you are facing:
If I connect to my nextcloud server on LAN, with local IP, it loads perfectly.
If I connect through reverse proxy, the login page loads, then when I submit the correct credentials, it reloads and add’s: login?redirect_url=/apps/dashboard/
Thus landing me back to the same login page, with the new URL.
This issue seems new as I dont recall having it before when I was setting up things, and using the hosted site through reverse proxy before to make sure it worked.
Is this the first time you’ve seen this error? Y
Steps to replicate it:
Just use reverse proxy.
The output of your Nextcloud log in Admin > Logging:
{"reqId":"ugwHNP19QJM3LlUdPTlt","level":2,"time":"2021-09-29T19:25:19+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"ugwHNP19QJM3LlUdPTlt","level":2,"time":"2021-09-29T19:25:19+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"ugwHNP19QJM3LlUdPTlt","level":2,"time":"2021-09-29T19:25:19+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"ugwHNP19QJM3LlUdPTlt","level":2,"time":"2021-09-29T19:25:19+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"d7DT5cPb8ubaLFg30sRW","level":2,"time":"2021-09-29T20:00:25+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"d7DT5cPb8ubaLFg30sRW","level":2,"time":"2021-09-29T20:00:25+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"d7DT5cPb8ubaLFg30sRW","level":2,"time":"2021-09-29T20:00:25+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"d7DT5cPb8ubaLFg30sRW","level":2,"time":"2021-09-29T20:00:25+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"HEkaVjC7wd2I3AiFK6zN","level":2,"time":"2021-09-29T20:35:13+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"HEkaVjC7wd2I3AiFK6zN","level":2,"time":"2021-09-29T20:35:13+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"HEkaVjC7wd2I3AiFK6zN","level":2,"time":"2021-09-29T20:35:13+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"HEkaVjC7wd2I3AiFK6zN","level":2,"time":"2021-09-29T20:35:13+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"owo1OW9j6nQQsaA8nY1Y","level":2,"time":"2021-09-29T21:05:14+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"owo1OW9j6nQQsaA8nY1Y","level":2,"time":"2021-09-29T21:05:14+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"owo1OW9j6nQQsaA8nY1Y","level":2,"time":"2021-09-29T21:05:14+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"owo1OW9j6nQQsaA8nY1Y","level":2,"time":"2021-09-29T21:05:14+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"jw07xzUCfth0sizue8fA","level":2,"time":"2021-09-29T21:40:05+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"jw07xzUCfth0sizue8fA","level":2,"time":"2021-09-29T21:40:05+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"jw07xzUCfth0sizue8fA","level":2,"time":"2021-09-29T21:40:05+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"jw07xzUCfth0sizue8fA","level":2,"time":"2021-09-29T21:40:05+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"LLVBrVDdUYMgpeTUka0h","level":2,"time":"2021-09-29T21:43:01+00:00","remoteAddr":"","user":"--","app":"fulltextsearch","method":"","url":"--","message":"Exception while cronIndex: Doctrine\\DBAL\\Exception\\ConnectionLost - An exception occurred while executing a query: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away","userAgent":"--","version":"22.1.0.1"}
{"reqId":"LLVBrVDdUYMgpeTUka0h","level":3,"time":"2021-09-29T21:43:01+00:00","remoteAddr":"","user":"--","app":"core","method":"","url":"--","message":"Error while running background job (class: OCA\\FullTextSearch\\Cron\\Index, arguments: )","userAgent":"--","version":"22.1.0.1","exception":{"Exception":"Doctrine\\DBAL\\Exception","Message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2006] MySQL server has gone away","Code":2006,"Trace":[{"file":"/config/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php","line":1486,"function":"connect","class":"OC\\DB\\Connection","type":"->"},{"file":"/config/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php","line":1014,"function":"getWrappedConnection","class":"Doctrine\\DBAL\\Connection","type":"->"},{"file":"/config/www/nextcloud/lib/private/DB/Connection.php","line":231,"function":"executeQuery","class":"Doctrine\\DBAL\\Connection","type":"->"},{"file":"/config/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php","line":210,"function":"executeQuery","class":"OC\\DB\\Connection","type":"->"},{"file":"/config/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php","line":287,"function":"execute","class":"Doctrine\\DBAL\\Query\\QueryBuilder","type":"->"},{"file":"/config/www/nextcloud/apps/fulltextsearch/lib/Db/TickRequest.php","line":134,"function":"execute","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->"},{"file":"/config/www/nextcloud/apps/fulltextsearch/lib/Service/RunningService.php","line":127,"function":"getTickById","class":"OCA\\FullTextSearch\\Db\\TickRequest","type":"->"},{"file":"/config/www/nextcloud/apps/fulltextsearch/lib/Model/Runner.php","line":413,"function":"stop","class":"OCA\\FullTextSearch\\Service\\RunningService","type":"->"},{"file":"/config/www/nextcloud/apps/fulltextsearch/lib/Cron/Index.php","line":107,"function":"exception","class":"OCA\\FullTextSearch\\Model\\Runner","type":"->"},{"file":"/config/www/nextcloud/lib/private/BackgroundJob/Job.php","line":51,"function":"run","class":"OCA\\FullTextSearch\\Cron\\Index","type":"->"},{"file":"/config/www/nextcloud/lib/private/BackgroundJob/TimedJob.php","line":58,"function":"execute","class":"OC\\BackgroundJob\\Job","type":"->"},{"file":"/config/www/nextcloud/cron.php","line":127,"function":"execute","class":"OC\\BackgroundJob\\TimedJob","type":"->"}],"File":"/config/www/nextcloud/lib/private/DB/Connection.php","Line":87,"CustomMessage":"Error while running background job (class: OCA\\FullTextSearch\\Cron\\Index, arguments: )"}}
{"reqId":"LLVBrVDdUYMgpeTUka0h","level":3,"time":"2021-09-29T21:43:01+00:00","remoteAddr":"","user":"--","app":"cron","method":"","url":"--","message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2006] MySQL server has gone away","userAgent":"--","version":"22.1.0.1","exception":{"Exception":"Doctrine\\DBAL\\Exception","Message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2006] MySQL server has gone away","Code":2006,"Trace":[{"file":"/config/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php","line":1486,"function":"connect","class":"OC\\DB\\Connection","type":"->"},{"file":"/config/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php","line":770,"function":"getWrappedConnection","class":"Doctrine\\DBAL\\Connection","type":"->"},{"file":"/config/www/nextcloud/3rdparty/doctrine/dbal/src/Query/Expression/ExpressionBuilder.php","line":307,"function":"quote","class":"Doctrine\\DBAL\\Connection","type":"->"},{"file":"/config/www/nextcloud/lib/private/DB/QueryBuilder/ExpressionBuilder/ExpressionBuilder.php","line":422,"function":"literal","class":"Doctrine\\DBAL\\Query\\Expression\\ExpressionBuilder","type":"->"},{"file":"/config/www/nextcloud/lib/private/BackgroundJob/JobList.php","line":304,"function":"literal","class":"OC\\DB\\QueryBuilder\\ExpressionBuilder\\ExpressionBuilder","type":"->"},{"file":"/config/www/nextcloud/lib/private/BackgroundJob/JobList.php","line":292,"function":"unlockJob","class":"OC\\BackgroundJob\\JobList","type":"->"},{"file":"/config/www/nextcloud/cron.php","line":131,"function":"setLastJob","class":"OC\\BackgroundJob\\JobList","type":"->"}],"File":"/config/www/nextcloud/lib/private/DB/Connection.php","Line":87,"CustomMessage":"--"}}
{"reqId":"2OBbIkay5qcPq61776fi","level":2,"time":"2021-09-29T22:20:25+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"2OBbIkay5qcPq61776fi","level":2,"time":"2021-09-29T22:20:26+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"2OBbIkay5qcPq61776fi","level":2,"time":"2021-09-29T22:20:26+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"2OBbIkay5qcPq61776fi","level":2,"time":"2021-09-29T22:20:26+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"ArfAP8CaaPxdU5MoTv48","level":2,"time":"2021-09-29T22:55:06+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"ArfAP8CaaPxdU5MoTv48","level":2,"time":"2021-09-29T22:55:06+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"ArfAP8CaaPxdU5MoTv48","level":2,"time":"2021-09-29T22:55:06+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"ArfAP8CaaPxdU5MoTv48","level":2,"time":"2021-09-29T22:55:06+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"DI73rwUiKuZIqI6487XH","level":2,"time":"2021-09-29T23:25:12+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"DI73rwUiKuZIqI6487XH","level":2,"time":"2021-09-29T23:25:13+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"DI73rwUiKuZIqI6487XH","level":2,"time":"2021-09-29T23:25:13+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"DI73rwUiKuZIqI6487XH","level":2,"time":"2021-09-29T23:25:13+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
{"reqId":"YSW6raIlIIqu41pHbh2z","level":2,"time":"2021-09-29T23:55:17+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifying photos of user sinaplej","userAgent":"--","version":"22.1.0.1"}
{"reqId":"YSW6raIlIIqu41pHbh2z","level":2,"time":"2021-09-29T23:55:18+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process output: sh: exec: line 1: : Permission denied\n","userAgent":"--","version":"22.1.0.1"}
{"reqId":"YSW6raIlIIqu41pHbh2z","level":2,"time":"2021-09-29T23:55:18+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process errored","userAgent":"--","version":"22.1.0.1"}
{"reqId":"YSW6raIlIIqu41pHbh2z","level":2,"time":"2021-09-29T23:55:18+00:00","remoteAddr":"","user":"--","app":"recognize","method":"","url":"--","message":"Classifier process error","userAgent":"--","version":"22.1.0.1"}
The output of my config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'memcache.local' => '\\OC\\Memcache\\APCu',
'datadirectory' => '/data',
'instanceid' => 'oc9sc9xsptcg',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => '192.168.1.55',
1 => 'localhost',
2 => 'nextcloud.xxx.com',
3 => 'https://nextcloud.xxx.com',
),
'trusted_proxies' =>
array (
0 => '192.168.1.55',
1 => 'nextcloud.xxx.com',
2 => '192.168.1.55:1080',
3 => 'https://nextcloud.xxx.com',
),
'dbtype' => 'mysql',
'version' => '22.1.0.1',
'overwrite.cli.url' => 'https://192.168.1.55:4443',
'dbname' => 'nextcloud',
'dbhost' => '192.168.1.55:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'xxx',
'installed' => true,
'enable_previews' => true,
'enabledPreviewProviders' =>
array (
1 => 'OC\\Preview\\PDF',
2 => 'OC\\Preview\\Image',
3 => 'OC\\Preview\\Photoshop',
4 => 'OC\\Preview\\TIFF',
5 => 'OC\\Preview\\SVG',
6 => 'OC\\Preview\\Movie',
7 => 'OC\\Preview\\MKV',
8 => 'OC\\Preview\\MP4',
9 => 'OC\\Preview\\AVI',
),
'maintenance' => false,
'allow_local_remote_servers' => true,
);
The output of my NGINX proxy
server {
set $forward_scheme https;
set $server "192.168.1.55";
set $port 4443;
listen 8080;
listen [::]:8080;
listen 4443 ssl http2;
listen [::]:4443 ssl http2;
server_name nextcloud.xxx.com;
# Let's Encrypt SSL
include conf.d/include/letsencrypt-acme-challenge.conf;
include conf.d/include/ssl-ciphers.conf;
ssl_certificate /etc/letsencrypt/live/npm-11/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/npm-11/privkey.pem;
# Asset Caching
include conf.d/include/assets.conf;
# Block Exploits
include conf.d/include/block-exploits.conf;
# HSTS (ngx_http_headers_module is required) (63072000 seconds = 2 years)
add_header Strict-Transport-Security "max-age=63072000;includeSubDomains; preload" always;
# Force SSL
include conf.d/include/force-ssl.conf;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $http_connection;
proxy_http_version 1.1;
access_log /config/log/proxy-host-7_access.log proxy;
error_log /config/log/proxy-host-7_error.log warn;
location / {
# HSTS (ngx_http_headers_module is required) (63072000 seconds = 2 years)
add_header Strict-Transport-Security "max-age=63072000;includeSubDomains; preload" always;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $http_connection;
proxy_http_version 1.1;
# Proxy!
include conf.d/include/proxy.conf;
}
# Custom
include /data/nginx/custom/server_proxy[.]conf;
}