Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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
here
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): 23.0.10.1
Operating system and version (eg, Ubuntu 20.04): ubuntu 21.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.46
PHP version (eg, 7.4): replace me
The issue you are facing:
Can’t login to nextcloud anymore.
I can access the login interface, but when I press the login button with the credentials filled I get:
Internal Server Error
The server is unable to execute your request.
If this happens again, please send the technical details below to the server administrator.
The server log file may provide more information.
Technical informationRemote address: 192.168.1.1 Request ID: ZHhIjO24bTsCYjK4X0OX
Where 192.168.1.1 is my firewall IP and it shoud be 192.168.1.200
Is this the first time you’ve seen this error? (Y/N): Y
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE
{"reqId":"JYPAlNS9t2RPVAWT9VRB","level":0,"time":"2023-03-27T17:41:44+02:00","remoteAddr":"192.168.1.1","user":"--","app":"extract","method":"OPTIONS","url":"/","message":"/appinfo/app.php is deprecated, use \\OCP\\AppFramework\\Bootstrap\\IBootstrap on the application class instead.","userAgent":"--","version":"23.0.10.1","data":{"app":"extract"}}