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External DNS Resolution Issue

Posted on 2006-06-22
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Linkysys Router -> Small Business Server 2003 -> Client PCs

Switched a client over to using their exchange server as their external mail server yesterday.  I also switch the domain registration to point MX record to the exchange server through a Linkysys Router on which I opened port 25 for the SMTP communication.  I also switched the location of their web page hosting site.

I've been monitoring the propagation.  I have a different ISP at home than at the office.  Mine propagated last night and has been good since.  I sent test mail from my home office last night and it made it to my test user on their exchange server fine.  Also from the test user to my external mail account.

My office and the clients office have the SBS 2003 Domain setup outline above using a small Linksys router for the Gateway.  Since my home office worked last night I tried pinging from my office at work all day.  Still have not gotten the server to pick up the correct dns from our ISP.  Problem I have with this is, if I manually switch the dns server on my network connection on my client pc to use the router instead of the server for DNS, I ping both the new mail address and the new web host address, and it give me the correct ip address.  Also if i try to go to the new web site, it works as well.

So, I think this tells me that my ISP DNS servers have the correct info, but my server is not getting the correct dns information from them.  I have the ISP DNS servers configured on my server.  I have tried running "ipconfig /flushdns" and "dnscmd /clearcache" at the command prompt of the server, and the ipconfig /flushdns at the client pc level.

I don't care so much about my server, but my client's have the same External DNS Server as we do.  Their office is right next door.  I have done the same steps on their server with the same results.  The only thing I have not done at their office is manually configuring the network connection on a client pc.  I'm going to assume the same results because, again we both have the same ISP DNS servers.

Any other ideas to try to get the server to update DNS properly?  Thanks
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Question by:compsol1993
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Jeffrey Kane - TechSoEasy earned 500 total points
ID: 16967890
That's a lot of detail... but through all of it you never mention that you ran the Configure Email and Internet Connection Wizard  (CEICW) which would be required.  

Please see http://sbsurl.com/ceicw for an overview.

If you've installed Service Pack 1 on your server, then you'll also see a link for "Repair Internet and E-mail Settings"  in the Internet & Email section of the Server Management Console.  Clicking this link will bring you right back to the CEICW.   Just a reinforcement that this is what you always run if you're having problems of that sort.

Jeff
TechSoEasy
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by:compsol1993
ID: 16970476
Thanks for the input Jeff.  Sorry about the long post.  :-)  I found a way around it, but I'm sure it will happen again.  I will try your technique next time.  For now what i did was go to the network connection, and remove my SBS 2003 from the DNS list, and only added the two DNS servers at my ISP.  I know I can't leave it this way, but it worked to get the correct data into the DNS cache.  After that, i removed the two ISP DNS Addresses and re-entered my SBS 2003 address again.  Everything now seems to be working fine on both my and my client's systems.

Thanks again.  I will read the article and use that technique next time this happens before beating my head against the way.  And Yes, I had run the Configure EMail and Internet Connection Wizard before.  I was unaware of the repair feature, however.

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by:Jeffrey Kane - TechSoEasy
ID: 16971947
You can run that thing as often as you like... check out why CEICW is your friend:
http://blogs.msdn.com/sbsdocsteam/archive/2006/02/24/538808.aspx

Jeff
TechSoEasy
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LVL 74

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by:Jeffrey Kane - TechSoEasy
ID: 16971968
Actually in rereading all of this... what you've done is caused the ISP's DNS servers to get pushed down to the clients... and this is NOT what you want because then they won't resolve anything internally... your network depends on DNS.

You do need to run the CEICW because the ISP's DNS IP's go in as the FORWARDERS on the screen that asks for them... what these do is for anything that doesn't resolve internally will then go to them.

Jeff
TechSoEasy
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