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DNS/SMTP

Here's the scenario. We're running Windows 2000 SP4. The main items of use on the server are IIS and SMTP, as the server hosts about 25 sites, some of which have feedback forms that use CDONTS or JMAIL to send the message containing the form results. When the server is rebooted, everything runs fine. After a few hours, though, the following happens:

1. I cannot open any websites via Internet Explorer.
2. I cannot get DNS results via NSLOOKUP if I use the "set vc" command, but I can otherwise.
3. No mail in the queue will send out.
4. CDONTS and JMAIL both error out saying that they cannot connect to the specified server.
5. I get messages in event viewer like: "Message delivery to the remote domain 'servint.com' failed for the following reason: An internal DNS error caused a failure to find the remote server."

Any ideas? Would something stupid like reinstalling SP4 help? As far as I know the server worked great before, so I don't think there's a hardware problem, but I'm willing to check anything and explore every possibility. Please feel free to ask any questions that may help clarify what's happening and help me get to the bottom of it.

Thanks!
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phoenix706
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phoenix706
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1 Solution
 
r-kCommented:
Is there anything in the event logs of interest?

There could be a memory leak somewhere. You can monitor memory use after a reboot and see if it creeps upwards over time.

I would also suggest running MBSA (http://www.microsoft.com/technet/security/tools/mbsahome.mspx) and applying relevant updates.
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phoenix706Author Commented:
I'm running the MBSA now. It looks like there are several updates missing, which I'm installing now. As soon as that's done I'll let it run for a little while and make sure everything's okay.
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phoenix706Author Commented:
I almost forgot to update this post :-)

Turns out we were able to solve everything by setting the DNS for the servers to our own DNS servers rather than the ISP's DNS. The MBSA, though, did help us find a few vulnerabilities we had missed earlier.

Thanks for the help!
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r-kCommented:
That's great. Thanks and good luck.
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