Exchange 2007 Hub Transport Server cannot see all DCs

Posted on 2009-02-16
Last Modified: 2012-08-13
We have four Exchange 2007 servers:
   MELEX01 and MELEX02 (Shared Storage clustered mailbox servers)
   MELEX03 - Hub Transport and Client Access
   MELEX04 - Unified Messaging

MELEX01, 02 and 04 ADACCESS reports all the domain controllers:
   In-site:      CDG 1 7 7 1 0 1 1 7 1      CDG 1 7 7 1 0 1 1 7 1      CDG 1 7 7 1 0 1 1 7 1
  Out-of-site:      CDG 1 7 7 1 0 1 1 7 1      CDG 1 7 7 1 0 1 1 7 1

MELEX03 however, only shows two and doesn't show MELDC01 as a GC:
  In-site:      CDG 1 7 7 1 0 1 1 7 1      C-- 1 6 7 0 0 1 1 7 1
All servers (in site) are on the same subnet and are not firewalled

DCDiag on MELDC01 doesn't reveal anything suspicious.

Site info:
   MEL2K02 is a DC for the top level domain and holds the schema master role
   MELBU01 is a DC for and is a GC
   MELDC01 is a DC for and holds all FSMO roles and is a DC

We are getting ready to decomission MELBU01 so it concerns me that the exchange server MELEX03 cannot see any other GCs.

Any suggestions?
Question by:wokwon
    LVL 11

    Expert Comment

    Can you bind to MELDC01 from MELEX03 using Ldp on prt 389 & 3268

    Author Comment

    Hi Sandeep,
    I can telnet to MELDC01 from MELEX03 on both those ports.  Is that what you mean?

    Accepted Solution

    I found the problem.

    On MELEX03, the DCs were explicitly defined in the registry as below.

    I replaced the MELBU01s with MELDC01 and then MELDC01 was detected as a GC,

    I deleted the whole Profiles and subkeys and ADAccess now reports all DCs including out of site DCs.
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Profiles\Default]
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Profiles\Default\UserDC1]
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Profiles\Default\UserDC2]
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Profiles\Default\UserGC1]
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Profiles\Default\UserGC2]

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