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Strange DNS issue - 3.Aug.2005 9:20:00 AM

UnifiedIT

Posts: 31
Joined: 20.Oct.2004
From: Grand Rapids, MI.
Status: offline

Right now all of the users at my company use ISA 2004 as a web proxy. I have is set in group policy for them to use the Autoconfiguration script and the address of the Proxy. If I get on any PC an select only the Automatically detect settings and then hit the Internet my DNS setting will change when I do an ipconfig /all. Our internal private IP is 172.20.20.0. The DNS entry that it gets changed to is 192.168.4.9, completely different. I do have a WPAD entry in my DNS server. I can not find any settings that could be changing this on my servers so I am at a loss of where to look for the funky setting. Any ideas will be greatly appreciated. I will post answers to questions you may have.

Thanks

Post #: 1

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RE: Strange DNS issue - 3.Aug.2005 1:54:00 PM

tshinder

Posts: 47659
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi UIT,

Wpad or any other ISA firewall related issue isn't going to change your client's DNS settings.

Check your DHCP server.

HTH<
Tom

(in reply to UnifiedIT)

Post #: 2

RE: Strange DNS issue - 3.Aug.2005 3:09:00 PM

UnifiedIT

Posts: 31
Joined: 20.Oct.2004
From: Grand Rapids, MI.
Status: offline

I thought myself until I did some testing to figure out what the problem was. If I set my PC up as a DHCP Client I will get the corrct address and everything works fine. No proxy and no setting check in the Internet settings box. If I do a ipconfig /release and a /renew I will get legit settings all day.

The minute I select only the Automatically configure settings checked box and hit the Internet my DNS entry will change from 172.20.20.33 to 192.168.4.9. If I uncheck the setting and release and renew my address I get the correct settings again.

My ISA 2004 is the only proxy on the network and this is why I am guessing that it is a setting wrong on my ISA box. I understand that ISA should not affect this in any way but from my troubleshooting I can not think of anything else.

Thanks for the reply
Any thoughts?

[ August 03, 2005, 03:18 PM: Message edited by: UnifiedIT ]

(in reply to UnifiedIT)

Post #: 3