Hi,
Apology if this issue been already on the forum but I could not find similar topic.
While configuring LDAP and AD authentication Some misconfiguration happened and suddenly not able to log-in to nextcloud even with administrative credentials.
Not able to log in with nc-admin credentials which I found from /var/lib/univention-appcenter/apps/nextcloud/data/integration/admin.secret
Are you still having the issue? Since around February 9th or 10th, when you posted this, we also haven’t been able to log-in to our NextCloud instance due to issues with “StartTLS” when establishing a connection via LDAP.
UPDATE: See other comment.
Okay, I found the solution in our case, which was to renew the TLS certificates at /etc/univention/ssl (which are the certificates used for LDAP.)
(Resource: Renewing the SSL certificates ).
Not sure if that would help with your issue.