DNS Issues – Mail fail to be delivered -

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Microsoft Exchange
We have a Windows 2000 server and Trend Micro IMSS SMTP gateway for routing email to the outside. The IMSS is also our content security and email filtering server. For the last couple of weeks we are experiencing a problem with the DNS where the server will fail over to the secondary DNS entry in the IP stack andfor some reason email will stop routing. Doing an NSloopup to any outside domain result on this, DNS request timed out. timeout was 2 seconds. *** Request to aol.com timed-out Rebooting the server is the only way to get email routing again. In Windows 2000 SP3 is there any way to force the server to keep the correct DNS server/entry? ANy help....

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If you are using statically assigned addresses, this should maintain your DNS order. All machines in the domain should point ONLY to the DNS server on one of the DCs, with the secondary being pointed to a secondary DCs DNS service. The DNS service on the DCs should be set up to forward requests to the ISP DNS servers.
What does an IPCONFIG show for DNS order?

If this is the way you are set up, and you are getting responses from other than your local DNS, I would look at the hosts file on on the local machine. Also do a search to be sure that there are not multiple hosts files. (should only be one in system32driversetc and in i386 or service pack stores) if you have more than one suspect a hijack, although I aould have thought that it would be doing it all the time if that were the case.

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  • 131313
    We are configure as follow: PRimanry DNS is pointing the ISP, secondary DNS,. there are not host file on the server.
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  • MCScrapE
    First, as the first reply indicated all clients in your Windows domain should use DC DNS servers. No outside ones. Two, are you using Exchange as your mail server? If so, I reocmmend that you change the DNS server entries for the server to internal DNS servers. Then go the the SMTP properties in Exchange and you can configure SMTP to use only outside DNS servers.
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  • 131313
    Thanks all but the problem has been resolved. The issues is with Microsoft implementation of their DNS services in Windows 2003 Server. Please read the Microsoft article , http://support.microsoft.com/Default.aspx?kbid=828731 Well, our super net admin and microsft certify dude, initially unstall the DNS from the DC laters installing it again for no apperent reasoing that we can determined and everything got screw up. Later, he update the DNS with the mention setting here, but forgot to also update the backup DNS, and for some reason Windows 2000 server will switch DNS at will, the secondary DNS was not update and we kept having issues. Right all DNS are modify and mail is routing again....I hate Microsoft, this does not happen in the unix world.......
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