RE: ISA Server Slowdowns...
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 7 Feb 2005 08:00:36 -0800
Odd - I didn't get Dan's posting...
Still, that snip looks vaguely familiar...
:-)
________________________________
From: Steve Moffat [mailto:steve@xxxxxxxxxx]
Sent: Mon 2/7/2005 7:23 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: ISA Server Slowdowns...
http://www.ISAserver.org
Number one should never have been an issue.
S
________________________________
From: Ball, Dan [mailto:DBall@xxxxxxxxxxx]
Sent: Monday, February 07, 2005 11:21 AM
To: ISA Mailing List
Subject: [isalist] ISA Server Slowdowns...
http://www.ISAserver.org
For those of you who have experienced the massive slowdowns that ISA2004 has
occasionally, I just recently closed out a case with Microsoft about this. Our
problem was most likely due to having multiple DNS settings, once I removed all
entries but the ones to our internal DNS server, we haven't experienced a
massive slowdown since.
Here are some of the major causes, as listed by the ISA Development/Testing
crew:
----------
1 - DNS lookup failures. The longer it takes ISA to resolve a name, or if a
lookup fails, the longer it takes to allow / deny the request
2 - Plug-in behavior - if (as in the case of SurfControl), it adds a LOT of
domains / content validation points, this can slow ISA to a crawl
3 - ISA policies. The more rules you create and the more complex the rule
criteria, the longer it takes for ISA to evaluate them. Generally, you should
use as few rules as possible and arrange them thus:
- Anonymous Deny
- Anonymous Allow
- Authenticated Deny
- Authenticated Allow
----------
Just thought I'd pass this on in case it helps anyone else...
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Like the T Rex - to which it is not often compared - the haggis has eyes that
react to movement.
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