Exchange 2003 stops responding after DC goes down

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Tags:
Microsoft Exchange
Microsoft Windows
Hello All, Not sure why this is happening and was wondering if you could shed some light on this subject. Scenario: We have a Windows 2K3 R2 native single domain with 2 DCs. Exchange 2003 Ent Ed SP2 DC1 - holds all FRSO roles DC2 - Global Catalog Our Exchange 2003 server is set to auto detect the config and GC domain controllers. Additional Info: Recipient Update Service (Ent Config) - DC2 Recipient Update Service (Domain) - DC1 Question: When we reboot DC1 all clients report a connection lose to the Exchange server if they have Outlook open. They are then prompted to log back on to this server via Outlook once DC1 comes back on line. Should DC2 take over if DC1 is down so this does not happen? Is it because DC1 holds all FRSO roles? Event Viewer messages on Exchange server when we reboot DC1: ________________________________________ Process MAD.EXE (PID=2232). All Domain Controller Servers in use are not responding: DC1.fpb.local DC2.fpb.local ___________________________________________ LDAP Bind was unsuccessful on directory DC1.fpb.local for distinguished name ''. Directory returned error:[0x51] Server Down. DC=fpb,DC=local _________________________________________ LDAP Bind was unsuccessful on directory DC1.fpb.local for distinguished name ''. Directory returned error:[0x34] Unavailable. DC=fpb,DC=local _________________________________________ Could not open LDAP session to directory 'DC2.fpb.local' using local service credentials. Cannot access Address List configuration information. Make sure the server 'DC2.fpb.local' is running. DC=fpb,DC=local ____________________________________________ LDAP Bind was unsuccessful on directory DC2.fpb.local for distinguished name ''. Directory returned error:[0x51] Server Down. DC=fpb,DC=local _____________________________________________ Thanks for all your help in this matter.
ASKED: January 25, 2007  10:18 AM
UPDATED: January 26, 2007  9:48 AM

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Are both of your DC’s setup as a DNS server?

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  • TripleT
    DC1 is a primary DNS and DC2 is a scondary. I have not set them up as AD integrated yet. Should I go ahead and do this?
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  • Icestormz
    Looking and reviewing you event log messages, it appears that you are having DNS issues related to LDAP. I would run netdiag and dcdiag and review for errors. Also, make sure that the DNS server to both servers are setup as Active Directory Integrated. This will help in the log run to make sure that both servers are on the same page.
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  • Petroleumman
    Hello, Active Directory is highly dependent on DNS. That said, if you have not set up AD integrated DNS you should certainly do so. Also, it is best to spread the FSMO roles between your two DC's. There is a great deal of information on best practices available on the internet to help you better understand how this works. As for adding additional GC servers, it's not necessary to have more than one in a single master domain. Multiple GC's become useful when you have multiple domains (child domains) or remote offices with DC's deployed. Good luck!
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