Exchange server try to look for old GC

After upgrading to windows 2008 R2 domain, our exchnage 2003 server still look for old GC server which was a old DC also, and gives error in application event log as Event 8260. We do have both our new windows 2008 DCs are mrked to be as GC but exchange still look for old. Is there any chnages need to be perform at exchnage level while upgrading of domain or after then?
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Gyan06Asked:
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Gyan06Connect With a Mentor Author Commented:
Yes the NIC has new DNS addresses.
Automatically Discover Servers check box is checked and I can see both the new DC and GC are in the list there. There is no entry of old DC/GC.
Still I get following errros in application event logs,
Event Type:      Error
Event Source:      MSExchangeSA
Event Category:      NSPI Proxy
Event ID:      9057
Description:
NSPI Proxy cannot contact any Global Catalog that supports the NSPI Service. New clients will be refused until a Global Catalog is available. After a Domain Controller is promoted to a Global Catalog, it must be rebooted to support MAPI Clients.
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Event Type:      Error
Event Source:      MSExchangeSA
Event Category:      NSPI Proxy
Event ID:      9176
Description:
NSPI Proxy can contact Global Catalog OLDGC.MYDOMAIN.com but it does not support the NSPI service. After a Domain Controller is promoted to a Global Catalog, the Global Catalog must be rebooted to support MAPI Clients.  Reboot OLDGC.MYDOMAIN.com as soon as possible.
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Event Type:      Error
Event Source:      MSExchangeAL
Event Category:      Service Control
Event ID:      8260
Description:
Could not open LDAP session to directory 'OLDGC.MYDOMAIN.com' using local service credentials. Cannot access Address List configuration information.  Make sure the server 'OLDGC.MYDOMAIN.com' is running.  DC=MYDOMAIN,DC=com
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LDAP Bind was unsuccessful on directory OLDGC.MYDOMAIN.com for distinguished name ''. Directory returned error:[0x51] Server Down.  DC=MYDOMAIN,DC=com
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Event Type:      Error
Event Source:      MSExchangeSA
Event Category:      General
Event ID:      9187
Description:
Microsoft Exchange System Attendant failed to add the local computer as a member of the DS group object 'cn=Exchange Domain Servers,cn=Users,dc=MYDOMAIN,dc=com'.

Please stop all the Microsoft Exchange services, add the local computer into the group manually and restart all the services.
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I Think we missed somthing , related to Exchange, while upgrading Domain to 2008 R2.

Please help.








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MAS (MVE)Technical Department HeadCommented:
did you change the DNS addresses to the new DCs in exchange2003 network settings?
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GovvyCommented:
In Exchange System Manager, expand Servers, right-click your Exchange server and then click Properties.

Click the Directory Access tab.

In Show, select Global Catalog Servers.

Check the Automatically discover servers check box
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Gyan06Author Commented:
I did not find any update on this question, please close it considering the same.
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