ldap_search Operations Error

I've runned my php Active Directory Admin Script on a IBM Websphere Server and it vorked perfectly.

Now i mirgated it on the AD - Server itself using MS IIS in combination with PHP 4.3.8 with LDAP support.

Now my script says: Operations Error while trying to perform a ldap_search. Normally this happens, if the bind didn't work correctly... But on the other Sever it works...

Any Ideas?

Seems that the ldap Base-DN is not correct and has to be in another format, when running the webserver on the same machine als the ADS... but what format?

hm.. added CN=Users to the Base-DN and it works... Strange