Server Freeze

I am running Symantec BackupExec 11D CPS. When I backup one of my servers I get the following Dns Errors and the server effectively goes offline. It will respond to a ping but you cannot logon or connect to it remotely in anyway. Only solution is to reboot the server.

Event ID 4015 - The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The event data contains the error.

Event ID 4004 - The DNS server was unable to complete directory service enumeration of zone .. This DNS server is configured to use information obtained from Active Directory for this zone and is unable to load the zone without it. Check that the Active Directory is functioning properly and repeat enumeration of the zone. The extended error debug information (which may be empty) is "". The event data contains the error.

Event ID 4000 - The DNS server was unable to open Active Directory. This DNS server is configured to obtain and use information from the directory for this zone and is unable to load the zone without it. Check that the Active Directory is functioning properly and reload the zone. The event data is the error code.

The server / system as a whole seem to run fine all day until the CPS Backup job runs.
I have done a dcdiag and no errors appear.

Please help

Thanks Craig
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CraigLeslieAsked:
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ChiefITCommented:
How goes the battle?
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ajwukTechnical Consultant / Project ManagerCommented:
Hi,
 First port of call would be to run dcdiag /fix on the domain controller and see what errors it comes back with. HTH.
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CraigLeslieAuthor Commented:
Hi,
Ran dcdiag /fix on both the domain controller and the server that freezes which is effectively the backup domain controller and no error were reported all tests passed successfully.

Both servers are DNS servers and are running as AD integrated.
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ChiefITCommented:
4015, 4004, and 400 Event Ids are usuallly a result of your domain controller not having a registered DNS setting.

What I have done in the past to fix this problem is go to the command prompt and type:
IPconfig /flushdns
then I stop the netlogon service
then I start the netlogon service
Then I go back to the command prompt ant type ipconfig /registerDNS.

You should perform this on both servers. That registers the DNS servers with itself.

Now you can do one of two things. You can wait up to a day for the servers to replicate DNS settings out, or you can force replicate these DNS registrations.

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CraigLeslieAuthor Commented:
I did the steps you suggested and it appears to have improved the situation but I am still getting the freeze occasionally. I have just ran an Exchange Best Practice Analysis and it says I have only one Global Catalog Server yet I know I have 2. The Dcdiad did not pickup any error but it appears not all is working correctly. I am just going to remove and reset the Global Catalog Servers and see if that fixes the issue
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CraigLeslieAuthor Commented:
Thanks for your help ChiefIT. Looks like it has all been fixed now
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