In all the companies I've ever worked for we've always had a resolving DNS server inhouse. That includes way back when we had a multilink dialup connection back in mid 90's. If you are using MS's DNS server, remove all forwarders, and use root hints (this make it become a resolver). Then go into the smtp setup and local machine dns and use that as the primary resolver. You'll find that you get much better perfomance in the long run. Also when things go wrong you have it under your control so you can purge a bad record from your cache for a domain and it will then re-query to get the correct info.
Make sure you have them updated by going to windowsupdate.microsoft.com, select custom and under optional software look for root hint updates. In the last 9 months one of the master root servers has changed IP's and you want the new value. Selecting express or relying on automatic updates will NOT apply that update. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jean-Paul Natola Sent: Wednesday, August 27, 2008 11:53 AM To: Exchange Discussions Subject: RE: Exchange intermittently connecting wrong servers I use my ISP's DNS servers (Covad) as forwarders on my internal DNS server- I did read an article where they observed the same situation- and they recommended removing the forwarders , is this advisable? http://member.dnsstuff.com/forums/showthread.php?t=1575592 Here's the excerpt "I manage about 40 Exchange servers and we don't see this problem. I wonder, What forwarders are you using on the server? We always remove all forwarders from Windows DNS." Also is there a way to change the native behavior of exchange looking for an A record if it finds no MX record? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Fred Skrotzki Sent: Wednesday, August 27, 2008 11:25 AM To: Exchange Discussions Subject: RE: Exchange intermittently connecting wrong servers See my posting. You clearly have a dns resolver issue now that you have said it is happening to more then one domain. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jean-Paul Natola Sent: Wednesday, August 27, 2008 11:05 AM To: Exchange Discussions Subject: RE: Exchange intermittently connecting wrong servers Its not just that address /ip its happening with different domains as well- What I'm trying to figure is why my Exchange would choose an IP that is not an MX record on the net -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Albert Duro Sent: Wednesday, August 27, 2008 10:49 AM To: Exchange Discussions Subject: Re: Exchange intermittently connecting wrong servers maybe doing a traceroute on 209.86.93.201 might tell you how and why it's going there ----- Original Message ----- From: "Jean-Paul Natola" <[EMAIL PROTECTED]> To: "Exchange Discussions" <[email protected]> Sent: Wednesday, August 27, 2008 6:42 AM Subject: Exchange intermittently connecting wrong servers Hi all, I'm not sure where to start here, but after getting numerous complaints regarding the inability to send mail - I have tracked the source of the problem. For some reason my exchange server randomly decides to send mail to the wrong server - Here's one example; User sends to her earthlink account; connects to 209.86.93.228 result OK 2008-08-26 14:28:49 209.86.93.228 OutboundConnectionResponse SMTPSVC1 FCI-EX - 25 - 250+1kxZxmZz3Nl34g0+Message+accepted+for+delivery 0 SMTP - - 2008-08-26 14:28:49 209.86.93.228 OutboundConnectionCommand SMTPSVC1 FCI-EX - 25 QUIT - 0 SMTP - - 2008-08-26 14:28:49 209.86.93.228 OutboundConnectionResponse SMTPSVC1 FCI-EX - 25 - 221+mx-pigeons.atl.sa.earthlink.net+closing+connection 0 SMTP - - Later on in the day she sends another email; my server decides to connect to 209.86.93.201 - result Not OK 2008-08-26 18:09:26 209.86.93.201 OutboundConnectionResponse SMTPSVC1 FCI-EX - 25 - 550+Authentication+required.+Help+at+http://www.earthlink.net/go/emailse tting s 0 SMTP - - Nslookup tells me; mx1.earthlink.net internet address = 209.86.93.226 mx2.earthlink.net internet address = 209.86.93.227 mx3.earthlink.net internet address = 209.86.93.228 mx4.earthlink.net internet address = 209.86.93.229 So I know why its failing - I know what it is going wrong , but WHY is it doing this and how do I correct it Could my ISP's DNS servers be on the fritz? And its not just happening with earthlink- thanks Jean-Paul _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] .com Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. 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