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08.27.2008 at 03:39AM PDT, ID: 23681444
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7.0

Proxy 502 error accessing external OWA site (client behind ISA server)

Asked by paul-adam in MS Forefront-ISA, Exchange Email Server, Secure Socket Layer (SSL) & HTTPS

Tags: , , ,

Hi,

I have a really strange issue Im working on for a client - that Im starting to bang my head against the wall with!!!!

My clients network uses an ISA 2006 server as a proxy for accessing the internet.

They have a handful of users who need to access a third party email system (exchange 2003 via OWA).

When accessing the OWA site they recieve the following error in their browser

Network Access Message: The page cannot be displayed
Technical Information (for Support personnel)
Error Code: 502 Proxy Error. The specified Secure Sockets Layer (SSL) port is not allowed. ISA Server is not configured to allow SSL requests from this port. Most Web browsers use port 443 for SSL requests. (12204)
IP Address: xx.xx.xx.xx (this is the local IP of the proxy server)
Date: 27/08/2008 09:58:
 
What is strange though is that the site they are connecting to IS running on 443! (we have access to the third parties exchange server to check).

I have also tested some other clients OWA sites and all but one site fails with the same error.

I have scoured through the one that does work against all the ones that dont and I cannot see ANY major differences in configuration that would cause this - At first I wondered if it was maybe something to do with intergrated auth - But I am not so sure.

Any thoughts would be greatly appreciated!

I should mention at this moment that ISA 2006 has not been SP1'd - although Im considering it!

Thanks

Paul AdamStart Free Trial
[+][-]08.27.2008 at 12:29PM PDT, ID: 22328327

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About this solution

Zones: MS Forefront-ISA, Exchange Email Server, Secure Socket Layer (SSL) & HTTPS
Tags: Microsoft, Exchange, ISA, 2003 and 2006, Accessing OWA from behind ISA
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Solution Provided By: keith_alabaster
Participating Experts: 1
Solution Grade: B
 
 
[+][-]09.03.2008 at 02:04PM PDT, ID: 22381968

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[+][-]09.03.2008 at 02:11PM PDT, ID: 22382023

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