Thread:Extension talk:LDAP Authentication/Unable to get plugin to work with OpenLDAP + Fix/reply

That would return all groups, not the groups a user is a member of, which would defeat the purpose of requiring groups. It sounds to me like you've improperly defined $wgLDAPRequiredGroups. Can you post your config with sensitive bits snipped out? Also, let me know which version of the extension you are using and which version of mediawiki.