• RSS
  • Twitter
  • FaceBook

Welcome to ISAserver.org

Forums | Register | Login | My Profile | Inbox | RSS RSS icon | My Subscription | My Forums | Address Book | Member List | Search | FAQ | Ticket List | Log Out

ISA not checking DNS from Local DNS server

Users viewing this topic: none

Logged in as: Guest
  Printable Version
All Forums >> [ISA Server 2004 General ] >> General >> ISA not checking DNS from Local DNS server Page: [1]
Login
Message << Older Topic   Newer Topic >>
ISA not checking DNS from Local DNS server - 20.Jul.2006 5:49:10 PM   
martin hockey

 

Posts: 7
Joined: 4.Oct.2005
Status: offline
Hello,

Brief configuration:
 
ISA 2004 SP1, Windows Server 2003 SP1.
 
Single network card, configured for a proxy/caching server.
 
TCP/IP settings on the network card configured to use internal DNS server.
From the command prompt on the ISA server I can resolve a DNS name for a web server on our internal network, this is on a foreign domain that is in our internal DNS records.
When using the proxy server I am unable to resolve the DNS name. The error reported is:
 
Error Code 11001: Host not found
Background: This error indicates that the gateway could not find the IP address of the website you are trying to access. This is usually due to a DNS-related error.
 
I have checked a couple of articles that relate to a rule allowing DNS lookup from the local host (ISA Server) to the DNS server. I have tried adding a rule to allow this but it makes no difference.
 
I am also able to resolve DNS names for servers on the same domain as ours.
 
Any idea’s would be appreciated….
Post #: 1
RE: ISA not checking DNS from Local DNS server - 20.Jul.2006 7:17:17 PM   
garconer

 

Posts: 75
Joined: 4.Jan.2006
Status: offline
Can you Telnet you internal DNS Server from ISA on port 53?
Check System Policy, there are some rules relating to trusted DNS Servers.

Create a Rule like this one

From: Local Host
To: Internal
Protocol: All
Users: ALL

and try again. But note, remove this rule as soon you´ve  get finished with the tests.

(in reply to martin hockey)
Post #: 2
RE: ISA not checking DNS from Local DNS server - 21.Jul.2006 10:57:22 AM   
martin hockey

 

Posts: 7
Joined: 4.Oct.2005
Status: offline
Hi,

Thanks for your response.

I have this working now, only im not 100% sure what I have done to fix it since I have made a few changes.

It has highlighted to me though that perhaps I need to review the settings, because I don't think I have it totally secure...

Cheers 

(in reply to garconer)
Post #: 3

Page:   [1] << Older Topic    Newer Topic >>
All Forums >> [ISA Server 2004 General ] >> General >> ISA not checking DNS from Local DNS server Page: [1]
Jump to:

New Messages No New Messages
Hot Topic w/ New Messages Hot Topic w/o New Messages
Locked w/ New Messages Locked w/o New Messages
 Post New Thread
 Reply to Message
 Post New Poll
 Submit Vote
 Delete My Own Post
 Delete My Own Thread
 Rate Posts