[isalist] Re: Strange Behaviour in ISA2006

  • From: Jim Harrison <Jim@xxxxxxxxxxxx>
  • To: "isalist@xxxxxxxxxxxxx" <isalist@xxxxxxxxxxxxx>
  • Date: Thu, 6 Nov 2008 09:22:37 -0800

http://www.ISAserver.org
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The combination of forward access and server login sluggishness point squarely 
at DNS.
Are you using the same DNS server to handle AD and external DNS queries?

Jim

-----Original Message-----
From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On 
Behalf Of Ball, Dan
Sent: Thursday, November 06, 2008 8:30 AM
To: 'isalist@xxxxxxxxxxxxx'
Subject: [isalist] Strange Behaviour in ISA2006

http://www.ISAserver.org
-------------------------------------------------------

I've noticed an interesting behavior of my ISA2006 box, and was wondering if 
anyone would have an idea of what might be causing it...

Periodically, browsing to websites (from our Intranet) becomes sluggish and we 
experience a lot of time-outs, sometimes it clears itself, but sometimes it 
gets worse.  Tracing this back, it appears to be a DNS-related issue, the names 
cannot be resolved correctly.  I've restarted the internal DNS servers when 
this happens, with little, if any improvement in performance.  So I log into 
the ISA server via Remote Desktop to see what is happening, the login takes 
significantly longer than usual, then right about the time I get logged in, 
everything works perfect again, so I cannot trace it.

I thought it was a coincidence the first few times, but it has happened a 
couple of dozen times now and it is a definite pattern.  Once I log into the 
ISA server via Remote Desktop, it starts working again.  Any ideas?

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