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Exchange 2007 Hub Transport Server cannot see all DCs

wokwon asked
Medium Priority
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:
    meldc01.melb.avtech.com.au      CDG 1 7 7 1 0 1 1 7 1
    mel2k02.avtech.com.au      CDG 1 7 7 1 0 1 1 7 1
    MELBU01.melb.avtech.com.au      CDG 1 7 7 1 0 1 1 7 1
   SHADC01.melb.avtech.com.au      CDG 1 7 7 1 0 1 1 7 1
   HCMCDC01.melb.avtech.com.au      CDG 1 7 7 1 0 1 1 7 1

MELEX03 however, only shows two and doesn't show MELDC01 as a GC:
   melbu01.melb.avtech.com.au      CDG 1 7 7 1 0 1 1 7 1
   meldc01.melb.avtech.com.au      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 avtech.com.au and holds the schema master role
   MELBU01 is a DC for melb.avtech.com.au and is a GC
   MELDC01 is a DC for melb.avtech.com.au 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?
Watch Question

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


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