We have recently seen an influx of users who are having LDAP issues.
LDAP and DNS have been, from the beginning, the two things that cause users the most headaches.
All of us in the Zimbra community are very happy to help you with your issues; however, many of the LDAP problems being posted have already been addressed in our wiki.
The LDAP article is extreamly comprehensive.
If you don't find your answer in the wiki, please do a search in the forums. Especially search for the error code.
Ofcourse, you are welcome to post a new topic regarding the issue.
Thanks & Good Luck,
The Zimbra Forums Moderators