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DNS and/or MX Record Issue?  CONFUSED

Posted on 2004-09-17
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Last Modified: 2010-04-19
Experts,

I'm having some difficulty with my pop3/smtp services in Win2003 Server.  Here's the setup: Server1 acting as primary domain controller and primary DNS, WINS.  Server 2 as secondary WINS and Server 3 on WINS replication via VPN.  Server 1 also acts as my mail server using Merak IceWarp Mail Server.  Herein is the problem and I don't know where to start to fix it:

My primary DNS server (server 1) has the name server1.domainname.com and has pop3 and smtp running.   However, my WINS clients on Server 3 seem to be having trouble finding the pop3 and smtp server name using Outlook 2003.  For a majority of the time, I can use server1.domainname.com as my pop3 and smtp server name and Outlook respons fine.  However, out of the blue it seems, the pop3 name stops responding and I have to change the pop3 settings to mail.domainname.com.   I have no clue what is happening or what causes this.

Extra info:  my primary DNS IP is internal 10.1.1.12.  My secondary DNS is my ISP 68.1.208.45.  I have an MX record (server1.domainname.com) and Host (A) record (10.1.1.12) on Server 1. Server 3 is a remote location connecting via VPN to central office.  Same ISP for both offices.

I hope this is plenty of information.  Thanks in advance for all help!
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Question by:stephenm93
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ColinRoyds earned 750 total points
ID: 12086528
I would setup DNS on server 3 with active directory forward lookup zones. so that desktops using server 3 wll also use it's dns, if you are using XP and 2k desktops they tend not to like using WINS to much , DNS is a better bet
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by:stephenm93
ID: 12086623
Thanks Colin.

I'll give it a try.  Can you offer any more detail on WHY this would happen?  Is it possible that my VPN connection is not stable and my clients on server 3 are temporarily losing contact with the primary DNS?  They would then have to resolve the name server using the ISP's MX record (they host my NS record).....

Just trying to resolve if it is a misconfiguration issue with the server or something else.

Regards,
Stephen
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by:ColinRoyds
ID: 12086782
I would imagine thats exactly what is happening. And thats why I recommend using a second dnd server on server 3, the other thing it could be is that there is no keep alive on the vpn, and the time it takes to connect may be longer than the timeout on the dns lookup, so fails and then goes to the isp

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by:ColinRoyds
ID: 12086792
sorry no dnd should read dns "And thats why I recommend using a second dnd server on server 3"
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