I have a problem that just started today that is preventing the configuration of new profiles from a child domain AGAINST OUR eXCHANGE 2007 mbx SERVER. It works from other domains, just not this one domain. I have run DCDiag and Best Practice Analyzer and also restarted the System Attendant on the exchnage server. I checked auto discovery using the child domain account, no issues reported, but still automatic or manual registration does not work. Existing user form this domain connect to exchange fine, it's just during the creation of the profile things fail Error: The Connection to the Microsoft Exchange server is unavailable. When I try and log on, I notice this in the event log on the Exchange Server Log Name: Application Source: MSExchange ADAccess Date: 17/07/2012 1:40:17 AM Event ID: 2394 Task Category: LDAP Level: Error Keywords: Classic User: N/A Computer: EX003.domain1.mydomain.com Description: Process STORE.EXE (PID=7296). An LDAP search call returned a referral - Server=DC04.domain1.mydomain.com Error code=8004090a (LDAP_REFERRAL (A referral was returned from the server)). Base DN=<GUID=82E41ECB-860D-405B-AD4E-6B9EA1FD95EF>, Filter=(objectclass=*), Scope=0. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange ADAccess" /> <EventID Qualifiers="49156">2394</EventID> <Level>2</Level> <Task>5</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2012-07-17T07:40:17.000Z" /> <EventRecordID>18650486</EventRecordID> <Channel>Application</Channel> <Computer>EX003.domain1.mydomain.com</Computer> <Security /> </System> <EventData> <Data>STORE.EXE</Data> <Data>7296</Data> <Data>dc04.domain2.mydomain.com</Data> <Data>8004090a</Data> <Data>&lt;GUID=82E41ECB-323D-405B-AD4E-6B9EA1FD95EF&gt;</Data> <Data>(objectclass=*)</Data> <Data>0</Data> <Data>LDAP_REFERRAL (A referral was returned from the server)</Data> </EventData> </Event>

Do you have Exchange servers in this problem domain or are they located in another domain? Check the 2080 event in the app logSukh

No exchange servers in the problem domain. The exchange servers are in the same forest, but a different domain.

Check the 2080 event in the app log --------------------------------------------------------------------------------Sukh

Can you see if your Exchange servers are still members of the Exchange install domain servers group?James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com