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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): 26.0.1.1
Operating system and version (eg, Ubuntu 20.04): debian 11
Apache or nginx version (eg, Apache 2.4.25): nginx 1.18.0.6
PHP version (eg, 7.4): 8.1
The issue you are facing:
When I try to login after inputting the username and password, I get the following error:
" Internal Server Error
The server was unable to complete your request.
If this happens again, please send the technical details below to the server administrator.
More details can be found in the server log.
Technical details
- Remote Address: 192.168.39.251
- Request ID: 1larJKnRh5WxyddCjEQs"
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
Repooted still the same issue
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
I am unable to log in as admin. The system is set to connect using AD. I can see the following errors in the nextcloud log:
\User_LDAP\{closure}“,“class”:“OCA\User_LDAP\Access”,“type”:”->“,“args”:[”*** sensitive parameters replaced “]},{“file”:”/usr/share/nginx/nextcloud/apps/user_ldap/lib/Access.php",“line”:253,“function”:“invokeLDAPMethod”,“class”:“OCA\User_LDAP\Access”,“type”:“->”,“args”:[" sensitive parameters replaced “]},{“file”:”/usr/share/nginx/nextcloud/apps/user_ldap/lib/Access.php",“line”:204,“function”:“executeRead”,“class”:“OCA\User_LDAP\Access”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_LDAP.php”,“line”:324,“function”:“readAttribute”,“class”:“OCA\User_LDAP\Access”,“type”:“->”},{“function”:“userExistsOnLDAP”,“class”:“OCA\User_LDAP\User_LDAP”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_Proxy.php”,“line”:110,“function”:“call_user_func_array”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/Proxy.php”,“line”:140,“function”:“walkBackends”,“class”:“OCA\User_LDAP\User_Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_Proxy.php”,“line”:246,“function”:“handleRequest”,“class”:“OCA\User_LDAP\Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_Proxy.php”,“line”:223,“function”:“userExistsOnLDAP”,“class”:“OCA\User_LDAP\User_Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/private/User/Manager.php”,“line”:184,“function”:“userExists”,“class”:“OCA\User_LDAP\User_Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/files_antivirus/lib/BackgroundJob/BackgroundScanner.php”,“line”:95,“function”:“get”,“class”:“OC\User\Manager”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/public/BackgroundJob/Job.php”,“line”:78,“function”:“run”,“class”:“OCA\Files_Antivirus\BackgroundJob\BackgroundScanner”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/public/BackgroundJob/TimedJob.php”,“line”:103,“function”:“start”,“class”:“OCP\BackgroundJob\Job”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/public/BackgroundJob/TimedJob.php”,“line”:93,“function”:“start”,“class”:“OCP\BackgroundJob\TimedJob”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/cron.php”,“line”:152,“function”:“execute”,“class”:“OCP\BackgroundJob\TimedJob”,“type”:“->”}],“File”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/LDAP.php”,“Line”:379,“message”:“LDAP Operations error”,“exception”:{},“CustomMessage”:“LDAP Operations error”}}
{“reqId”:“yF6xbXu3kirlWxYKLPdc”,“level”:3,“time”:“2023-05-28T12:35:18+00:00”,“remoteAddr”:“”,“user”:“–”,“app”:“files_antivirus”,“method”:“”,“url”:“–”,“message”:“LDAP Operations error”,“userAgent”:“–”,“version”:“26.0.1.1”,“exception”:{“Exception”:“Exception”,“Message”:“LDAP Operations error”,“Code”:1,“Trace”:[{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/LDAP.php”,“line”:411,“function”:“processLDAPError”,“class”:“OCA\User_LDAP\LDAP”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/LDAP.php”,“line”:308,“function”:“postFunctionCall”,“class”:“OCA\User_LDAP\LDAP”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/LDAP.php”,“line”:186,“function”:“invokeLDAPMethod”,“class”:“OCA\User_LDAP\LDAP”,“type”:“->”,“args”:[" sensitive parameters replaced “]},{“function”:“read”,“class”:“OCA\User_LDAP\LDAP”,“type”:”->“},{“file”:”/usr/share/nginx/nextcloud/apps/user_ldap/lib/Access.php",“line”:1055,“function”:“call_user_func_array”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/Access.php”,“line”:1058,“function”:“OCA\User_LDAP\{closure}”,“class”:“OCA\User_LDAP\Access”,“type”:“->”,“args”:[" sensitive parameters replaced “]},{“file”:”/usr/share/nginx/nextcloud/apps/user_ldap/lib/Access.php",“line”:253,“function”:“invokeLDAPMethod”,“class”:“OCA\User_LDAP\Access”,“type”:“->”,“args”:[" sensitive parameters replaced ***“]},{“file”:”/usr/share/nginx/nextcloud/apps/user_ldap/lib/Access.php",“line”:204,“function”:“executeRead”,“class”:“OCA\User_LDAP\Access”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_LDAP.php”,“line”:324,“function”:“readAttribute”,“class”:“OCA\User_LDAP\Access”,“type”:“->”},{“function”:“userExistsOnLDAP”,“class”:“OCA\User_LDAP\User_LDAP”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_Proxy.php”,“line”:110,“function”:“call_user_func_array”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/Proxy.php”,“line”:140,“function”:“walkBackends”,“class”:“OCA\User_LDAP\User_Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_Proxy.php”,“line”:246,“function”:“handleRequest”,“class”:“OCA\User_LDAP\Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/User_Proxy.php”,“line”:223,“function”:“userExistsOnLDAP”,“class”:“OCA\User_LDAP\User_Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/private/User/Manager.php”,“line”:184,“function”:“userExists”,“class”:“OCA\User_LDAP\User_Proxy”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/apps/files_antivirus/lib/BackgroundJob/BackgroundScanner.php”,“line”:95,“function”:“get”,“class”:“OC\User\Manager”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/public/BackgroundJob/Job.php”,“line”:78,“function”:“run”,“class”:“OCA\Files_Antivirus\BackgroundJob\BackgroundScanner”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/public/BackgroundJob/TimedJob.php”,“line”:103,“function”:“start”,“class”:“OCP\BackgroundJob\Job”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/lib/public/BackgroundJob/TimedJob.php”,“line”:93,“function”:“start”,“class”:“OCP\BackgroundJob\TimedJob”,“type”:“->”},{“file”:“/usr/share/nginx/nextcloud/cron.php”,“line”:152,“function”:“execute”,“class”:“OCP\BackgroundJob\TimedJob”,“type”:“->”}],“File”:“/usr/share/nginx/nextcloud/apps/user_ldap/lib/LDAP.php”,“Line”:379,“message”:“LDAP Operations error”,“exception”:{},“CustomMessage”:“LDAP Operations error”}}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
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
Any advice or guidance please
