RE: Upstream Web Proxy "not available"
- From: "John Tolmachoff" <isalist@xxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Tue, 4 Mar 2003 08:50:06 -0800
Tom, with a question? Shock.
:))
I read something like that a few months ago.
Let me rack my brain and see if I can remember where. Of course, it may be
an entirely different circumstance too.
John Tolmachoff MCSE, CSSA
IT Manager, Network Engineer
RelianceSoft, Inc.
Fullerton, CA 92835
www.reliancesoft.com
> -----Original Message-----
> From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
> Sent: Tuesday, March 04, 2003 8:04 AM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Upstream Web Proxy "not available"
>
> http://www.ISAserver.org
>
>
> Hey folks,
>
> Anyone else notice this type of thing going on? :
>
> ==============================
> "The Web Proxy service detected that the upstream
> proxy '10.32.254.59' is not available
>
> Our setup is the following...
>
> 2 ISA servers in the array (NLB), bought with two NIC's in
> teaming so one IP address per ISA server and virtual IP
> address for array..
>
> Users connect through array IP address and ISA server
> forwards it to our upstream proxy (Linux firewall)
>
> What happens from time to time (on avarge every 30
> minutes) is that ISA server will send on the same socket
> two TCPIP packets with different sequence number??
> Upstrema proxy will acknowledge first one, but it will
> drop second one, then ISA server thinks that upstream
> proxy is not available and drops to backup route... then
> after 2 minutes it will switch back to primary route..
>
> Do you have any ideas is this normal for ISA to do? and
> what can be done to fix it?"
> ============================
>
> Thanks!
> Tom
>
> Thomas W Shinder
> www.isaserver.org/shinder
> ISA Server and Beyond: http://tinyurl.com/1jq1
> Configuring ISA Server: http://tinyurl.com/1llp
>
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