After upgrading (ComfortUpdate) to version 5.1.4+210824 from last version 3.xx, LDAP autentication stoped working.
Bugs are in the file AuthLDAP.php.
1. strpos() function has wrong syntax "str_pos()".
2. some other minor changes disallow (after correction strpos error) finding users.
Sollution: I replaced the module with the previous version AuthLDAP.php and it work well again.
It would probably be a good idea to check this module before it becomes part of the next update