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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
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): 25.10
Operating system and version (eg, Ubuntu 20.04): 22.04 LTS
Apache or nginx version (eg, Apache 2.4.25): nginx 1.25.2-1
PHP version (eg, 7.4): 8.1
The issue you are facing:
After doing a release-upgrade from 20.04, first my Nextcloud was available via its URL (still in maintenance mode).
I had the ondrej-ppa version of PHP installed, but purged it and installed the ubuntu-version 8.1.
After configuring it the same as the old version, i’ve got an internal server error when i try to reach my NC.
The nginx-error log states:
2023/09/07 13:17:55 [crit] 4660#4660: *108 connect() to unix:/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.>
The file is there and has its permissions set to srw-rw---- 1 www-data www-data
There’s also this link in that directory: php-fpm.sock -> /etc/alternatives/php-fpm.sock
Should i worry about that?
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it: Not sure …
The output of your Nextcloud log in Admin > Logging:
not availible (see above) but also useless in this case, i think
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => ++++++++++++
'passwordsalt' => +++++++++++++++++++++
'secret' => +++++++++++++++++++
'trusted_domains' =>
array (
0 => '+++++++++++++',
1 => '+++++++++++++++',
),
'datadirectory' => '/var/nextcloud_data',
'dbtype' => 'mysql',
'version' => '25.0.10.1',
'overwrite.cli.url' => ++++++++++++++++++++,
'dbname' => ++++++++++++++++++++,
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => +++++++++++++++++++++,
'dbpassword' => +++++++++++++++++++++,
'installed' => true,
'maintenance' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.0,
),
'overwriteprotocol' => 'https',
'logtimezone' => 'Europe/Berlin',
'auth.bruteforce.protection.enabled' => false,
'mail_from_address' => 'webmaster',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => ++++++++++++++++++,
'mail_smtpauth' => 1,
'mail_smtphost' => ++++++++++++++++++++++++,
'mail_smtpname' => ++++++++++++++++++++++,
'mail_smtppassword' => ++++++++++++++++++++++++++++,
'mail_smtpport' => '465',
'mail_smtpsecure' => 'ssl',
'mail_smtpauthtype' => 'LOGIN',
'share_folder' => '/Mit mir geteilt',
'skeletondirectory' => '/var/nextcloud_defaultfiles',
'default_language' => 'de',
'default_locale' => 'de',
'loglevel' => 0,
'theme' => '',
'app_install_overwrite' =>
array (
0 => 'spreed',
1 => 'documentserver_community',
),
'default_phone_region' => 'DE',
The output of your Apache/nginx/system log in /var/log/____:
2023/09/07 13:14:49 [crit] 4660#4660: *96 connect() to unix:/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.1>
2023/09/07 13:14:49 [crit] 4660#4660: *99 connect() to unix:/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.1>
2023/09/07 13:15:51 [crit] 4660#4660: *102 connect() to unix:/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.>
2023/09/07 13:16:53 [crit] 4660#4660: *105 connect() to unix:/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.>
2023/09/07 13:17:55 [crit] 4660#4660: *108 connect() to unix:/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.>
PASTE HERE
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