Network Share unavailable after DNS Change

domain-name-systemnetworkingwindows-server-2003

I have a server, called Server1 with various network shares on it. Our users map to this share using \\Server1\FileShareName1.

During a DR Test, we rerouted all network traffic from Server1 to Server21. All folder shares are set up on Server21.

We were hoping the the network shares would still be accessible using \\Server1\FileNameShare1, unfortunately, they are not.

Does anyone know why this is happening?

This is a Win2003 Environment, and DNS was flushed. I confirmed that IP addresses are matching between the two servers.

Any help or insight is much appreciated.

Best Answer

I'm assuming that you're creating a CNAME record for Server1 that points to Server21 or that you're changing the A record for Server1 to point to Server21's ip address. In either case you need to disable strict name checking on Server21:

http://support.microsoft.com/kb/281308

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Second if it's fairly easily reproducable I'd dump a packet sniffer on the machines (using a mirror port or transparent sniffer) and see if there's anything obvious at the protocol level.

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I am curious what kind of firewall setup you have, and if it differs on your production and non-production systems. According to here, these are the ports you need to allow:

netbios-ns 137/udp # NetBIOS Name Service
netbios-dgm 138/udp # NetBIOS Datagram Service
netbios-ssn 139/tcp # NetBIOS Session Service
microsoft-ds 445/tcp # Microsoft Directory Service

If you have some of these set up, but not all of them, it could explain why you get the password authentication box but then it can no longer communicate with your samba system.

Best Answer

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