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Error Code 12206: Proxy chain loop

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Error Code 12206: Proxy chain loop - 16.Sep.2008 3:19:09 PM   


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Joined: 16.Sep.2008
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I'm running ISA 2006 Enterprise with a single server in a array - with 3 NICs: DMZ, LAN, and WAN.  All is working well - other than a random proxy loop issue, and the latest ISA BPA currently reports "The Routing (chainging) failure warning alert was signaled 100 times"

The WAN nic is configured with 2 default gateways - our ISP assigned us 2 IP subnet ranges as we host a number of SSL websites behind ISA.  I had originally tried setting up dual ISA servers using 2 WAN NICs, but NLB didn't work as 2 default gateways is unsupported for ISA 2006 (while worked fine for us with ISA 2004...), so had to dummy down our ISA 2006 deployment.

The Proxy loop error (Event ID 14141) occurs randomly (ie: didn't notice it for a week and a half, then suddenly twice in the past few days), and users can't browse some websites for 5-10 minutes.

I work for a Microsoft Gold Partner, and I've talked with PSS a few times - and tried a few things that haven't helped.

1 - changed from using Enterprise network to local network config
2 - removed internal DNS entries from WAN tcpip config
3 - removed KasperskyŽ Anti-Virus for Microsoft ISA Server (just in case this was causing the problem).

Anyone have any further suggestions/comments/questions on how I might resolve this intermittent annoyance?

Thanks in advance.

Post #: 1
RE: Error Code 12206: Proxy chain loop - 16.Sep.2008 5:44:52 PM   
Jason Jones


Posts: 4663
Joined: 30.Jul.2002
From: United Kingdom
Status: offline
ISA only supports a single default gateway.





Jason Jones | Forefront MVP | Silversands Ltd
My Blogs: http://blog.msedge.org.uk/ and http://blog.msfirewall.org.uk/

(in reply to gharshenin2)
Post #: 2

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