Problem
After an update Nextcloud does not connect to the LDAP server any more.
Environment
Using Nextcloud in an Docker container.
When troubleshooting through univention-app logs nextcloud you get an output similar to the following:
:"--","message":{"Exception":"OC\\ServerNotAvailableException","Message":"Lost connection to LDAP server.","Code":0,"Trace":[{"file":"/var/www/html/apps/user_ldap/lib/LDAP.php","line":420,"function":"processLDAPError","class":"OCA\\User_LDAP\\LDAP","type":"->"},{"file":"/var/www/html/apps/user_ldap
Solution
For some reason during the update some Nextcloud settings get lost. Reconfigure them by:
univention-app shell -u www.data nextcloud
cd /var/www/html
./occ ldap:set-config s01 ldapHost <YOUR INTERNAL NEXTCLOUD HOST>
./occ ldap:set-config s01 ldapTLS 1
./occ ldap:set-config s01 ldapPort 7389
exit
univention-app restart nextcloud