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New PIX- Can't access www.yahoo.com

Posted on 2004-09-09
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Last Modified: 2013-11-16
I set up a PIX with 6.3.4 and 3.0.2.  Everything seems to work except the ability to access the main yahoo site.  I do not have any filters for Java or ActiveX.  I am not doing URL filtering.  Any ideas?

Steve
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Question by:smeek
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td_miles earned 1500 total points
ID: 12023914
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by:smeek
ID: 12025824
I will try the ping test.

Additional info, this is a T1. We replaced a SnapGear firewall with a PIX.

Steve
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by:Tim Holman
ID: 12027704
Can you access the yahoo IP addresses ?
Is DNS working internally ?
This sounds to me like a name resolution problem.  Maybe the PIX isn't configured to be able to see port 53 on Internet DNS servers in order to resolve the name, and you're just left with whatever DNS entries are cached on local machines ??
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by:smeek
ID: 12032549
TD, You got me on thinking down a track...

I think it was actually a change in Windows 2003 DNS implementation.  It seems the 2003 implementation of DNS allows DNS to accept >512 byte UDP replies.  Cisco's DNS fixup seemed to limit it to 512K inspection.  I could have removed the fixup but instead increased it's max length.  As soon as I changed, I could connect with no issues.

Steve
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by:Tim Holman
ID: 12039277
> TD, You got me on thinking down a track...

Hmmm... I fail to see why, seeming I was the only one to mention DNS ?

*sigh*

;)
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by:td_miles
ID: 12039782
Tim, I'm happy to offer you some of the points if you feel hard done by ?
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by:smeek
ID: 12039928
Well, as you can see from my posting, I started back on the issue at 7:41am.  I had it solved by 9:30am...  I could have used your suggestion a bit earlier, maybe I could have resolved even quicker.

Steve
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by:Tim Holman
ID: 12042198
A-ha... !  No problem, I see your point ! Sorry.  ;)
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