For the past week, we've had users not being able to send out emails to the likes of Yahoo, Mindspring, Blackberry.net, Verizon Wireless and a few other providers. Now the thing is there was MyDoom attack on some of these sites. Once we verified the domains were up and functional...we tried checking to see if there was a blacklist being used and our domain RUDIN.COM was being blocked. We gave up and started searching within our own internal DNS records.
Randomly, the sites would be resolved if you did an nslookup form the cmd prompt. I finally found out that the cache was not being cleared or is it wasnt clearing it in a timely fashion. So the temporary fix was to go into the Administrator Console and clear the DNS cache. Called up Microsoft and they had a fix to my problem ....A HOTFIX!! - See KB Article 830905.
So tonight I patched our DNS server and miraculously, the Exchange 2003 Mail server started routing all the backed up mail it had in its Queue.
If you have any questions or would like the patch, feel free to email me.
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