DNS Server Malfunctioning

July 16, 2010 at 02:24:02
Specs: Windows Server 2003 R2 SP2
Hi,

we've got a strange DNS problem. To give 2 examples:

* Our mail relay server sometimes can't deliver mails. I've been investigating this and it turns out it finds wrong or incomple MX records. The same goes for

* And the same with our proxy server, sometimes some websites are not reachable ("Website Not Found") not because the website address is incorrect, but because our DNS server didn't find the correct records!

Our DNS server (Windows Server 2003 R2 SP2) has the default roothints. When this occurs I have to do a flushdns and restart the DNS Server Service. After that it finds the correct records and the mails get out, websites load again.

What could be the cause of this and the possible resolution?

I've been thinking to put in a DNS forwarders for all external addresses to our network provider, but I'd rather not rely on that (in case we ever change, they change their DNS config, ...)

thanks in advance for all advice

-Walter-


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#1
July 16, 2010 at 07:15:30
To start with, if you're running a Windows "Active Directory" integrated domain and you're talking about your domain's DNS server,I have to ask, why are you trying to use your internal DNS server to resolve external websites?

Setup forwarding on your DNS server and all requests outside the local zone will be (correctly) passed to external DNS servers for resolution and these problems should go away.

If you have concerns about forwarding to your ISP's DNS servers then do a little googling to find out the main internet DNS servers and use their IP's.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#2
August 3, 2010 at 01:10:22
Thanks for your reply

if you're running a Windows "Active Directory" integrated domain and you're talking about your domain's DNS server
>> yes

,I have to ask, why are you trying to use your internal DNS server to resolve external websites?
>> our DNS server processes all internal queries and for all external queries it refers to the root hints.


Setup forwarding on your DNS server and all requests outside the local zone will be (correctly) passed to external DNS servers for resolution and these problems should go away.
If you have concerns about forwarding to your ISP's DNS servers then do a little googling to find out the main internet DNS servers and use their IP's.
>> isn't this what the root hints are ment for?


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