Exchange Server is unable to communicate GCS

My Exchange Server is unable to communicate Global Catalog Server.
Network is fine. Can any one help me how to troubleshoot.
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AhmedAliShaikAsked:
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firemanf29Commented:
1. Do you have a Global Catalog Server in the same site as the exchange server?
     Each Sites should have a GC server.
2. As asked above do you have GC srv records in DNS for the Exchange server?
     DNS should contain srv records for all your GC servers.
3. Is your Exchange pointing to the internal DNS servers?  
     Internal DNS servers are required for Exchange to work correctly.
4. Have you verified the domain controller you're referencing is a GC server in Active Directory Sties and Services?
5. Can you ping the GC server from your Exchange server by full dns name?
    Example:  ping exchage.mydomain.local
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Hendrik WieseInformation Security ManagerCommented:
What version of exchange are you running?

Have a look at the following link to troubleshoot:

http://emailsolutions.searchexchange.com/kw;Global+Catalog+Server/exchange-content.htm
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Hendrik WieseInformation Security ManagerCommented:
Also refer to:

http://www.tech-faq.com/the-global-catalog-server.html

Just another question: Is there Global Catelog server in the same site as your exchange server?
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Hendrik WieseInformation Security ManagerCommented:
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AhmedAliShaikAuthor Commented:
Yes GCS is in the same site.
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AhmedAliShaikAuthor Commented:
I am running Exch 2003.
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Hendrik WieseInformation Security ManagerCommented:
1. Has this Exchange server worked before or is it a new installation?
2. Also send me the error that you get inside your logs?

Then ensure that your server is running the latest update:

Install Exchange Server 2003 Service Pack 2
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Hendrik WieseInformation Security ManagerCommented:
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Hendrik WieseInformation Security ManagerCommented:
Sorry ignore the last link
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Suliman Abu KharroubIT Consultant Commented:
do you have GC srv records on DNS server ?zone--> domain.local-->msdcs->GC-->_sites-->Sitename-->TCP

Can you runas (authenticate users) any app from exchange server ?
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