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ISA Server stops responding

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ISA Server stops responding - 23.Jul.2009 1:46:21 AM   


Posts: 21
Joined: 18.Aug.2003
Status: offline
Dear ISA gurus!
ISA server stops receiving any connections at some point of time. The ISA itself does not show any alerts. It happens once a day or even more frequently. The Apllication part of the Event log shows
Event Type: Error
Event Source: Microsoft Firewall
Event Category: None
Event ID: 21282
Date:  23.07.2009
Time:  16:10:59
User:  N/A
Computer: Computername
The number of denied TCP and non-TCP packets per second exceeded the system limit. As a result, ISA Server reduced the number of records of denied packets that are written in the log.  One or many zombie hosts may be attempting an attack against a victim server, but ISA Server policy blocks the attack traffic.  See the product documentation for more information about ISA Server flood resiliency.
I have turned off Flood mitigation globally already and nothing changed.
The number of connections is high because of torrent users wth a number of sessions.
Please help.

< Message edited by abissum -- 23.Jul.2009 2:03:32 AM >
Post #: 1
RE: ISA Server stops responding - 17.Aug.2009 1:54:37 AM   


Posts: 21
Joined: 18.Aug.2003
Status: offline
Any specialists here?

(in reply to abissum)
Post #: 2
RE: ISA Server stops responding - 17.Aug.2009 11:43:05 AM   


Posts: 477
Joined: 20.Jan.2009
From: Southern California
Status: offline
There are plenty of specialists here, trust me.    When a post receives no replies it means that none of us have an answer to your question.

This is unusual and unexpected behavior, certainly.  If you've disabled flood mitigation and are still seeing this message, obviously the ISA firewall shouldn't care about this (or at least that's what I think).

Have you tried to identify which host is sending this traffic to the firewall?


Richard Hicks - Forefront MVP

(in reply to abissum)
Post #: 3

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