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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): 23.0.0
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.41
PHP version (eg, 7.4): 8.0.15
Im using Plesk Obsidian 18.0.41 as Webhost.
The issue you are facing:
All my Clients have synchronization Problems. They get errors like “Error 403 forbidden”.
I think since changing the ownership of the data folder this issue appeared. But i do not know what to do anymore.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Install apcu and redis modules/dependencies
- Chance config.php to only use APCu memchace and PHP config to enable apc
- Disable redis service
- System does not use APCu memchace, when i was checking logs
- Give User “psacln” permission to use /data folder ( found in a help forum)
205 chown -R vhostuser:psacln /nc
/nc is my data folder (how do i revert this command?)
The output of your Nextcloud log in Admin > Logging:
Since changeing the ownership, the Logging Data on the admin webpage does not Update, so i have to put in the php logs manually and correct any identifiying information in here:
**This error keeps repeating for each of my clients:**
[17-Mar-2022 00:00:06] WARNING: [pool vhost.de] child 560305 said into stderr: "ERROR: Unable to set php_value 'clear_env'"
[17-Mar-2022 00:00:06] WARNING: [pool vhost.de] child 560305 said into stderr: "ERROR: Unable to set php_value 'apc.enable'"
Failed to open stream: Permission denied at /var/www/vhosts/vhost.de/httpdocs/lib/private/Files/Storage/Local.php#282","userAgent":"Mozilla/5.0 (Windows) mirall/3.3.5stable-Win64 (build 20210930) (Nextcloud, windows-10.0.19043 ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"23.0.0.10","exception":{"Exception":"Err"}
**This error shows that php cant write into the nc log file...**
[17-Mar-2022 09:12:01] WARNING: [pool asscloud.de] child 560277 said into stderr: "PHP message: {"reqId":"sq0UoAqMHSnhXYgdBH3M","level":3,"time":"2022-03-17T09:12:01+00:00","remoteAddr":"91.63.76.100","user":"USER_NAME","app":"PHP","method":"POST","url":"/remote.php/dav/bulk","message":"fopen(/nc/nextcloud.log): Failed to open stream: Permission denied at /var/www/vhosts/asscloud.de/httpdocs/lib/private/Log/File.php#84","userAgent":"Mozilla/5.0 (Windows) mirall/3.4.2stable-Win64 (build 20220127) (Nextcloud, windows-10.0.19042 ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"23.0.0.10"}"
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 => 'redacted',
),
'activity_expire_days' => 365,
'datadirectory' => '/nc',
'dbtype' => 'mysql',
'version' => '23.0.0.10',
'overwrite.cli.url' => 'https://redacted',
'dbname' => 'redacted',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'redacted_db',
'dbpassword' => '********',
'installed' => true,
'filesystem_check_changes' => 0,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'nextcloud',
'mail_domain' => '**********',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => '********',
'mail_smtpport' => '587',
'mail_smtpauth' => 1,
'mail_smtpname' => '************',
'mail_smtppassword' => '*************',
'output_buffering' => 'OFF',
'maintenance' => false,
'default_phone_region' => 'DE',
'default_language' => 'de',
'force_language' => 'de',
'default_locale' => 'de_DE',
'force_locale' => 'de_DE',
'allow_user_to_change_display_name' => false,
'filelocking.enabled' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'redis' =>
array (
'host' => 0,
'port' => 0,
),
'theme' => '',
'loglevel' => 2,
'app_install_overwrite' =>
array (
0 => 'passwords',
1 => 'files_trackdownloads',
2 => 'twofactor_admin',
),
);
When listing the directories the owner of the files in the data directory is “systemd-coredump” and the group is “www-data”. Since the problem persists, i have been changing the directory permissions manually to chmod 775 “directoryname”. This was a small workaround for me, because the nextcloud instance is in a productive enviornment.
Do you guys have any ideas?