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The HTTP request includes a non-supported header on ISA 2004

Posted on 2006-06-29
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Last Modified: 2008-01-09
Good day

I've got an ISA 2004 server that is used for internet access only, when I try to connecto to a certain URL through the ISA, I get the following error:

Technical Information (for support personnel)
Error Code: 502 Proxy Error. The HTTP request includes a non-supported header. Contact your ISA Server administrator. (12156)
IP Address: 69.25.56.150
Date: 29/06/06 10:12:34 AM
Server: ismid01
Source: proxy

Where can I see what the Header is that the URL is using and how do I allow this Header to go through ISA

Any Help would be appreciated

Thx
Floris
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Question by:Florisvdd
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LVL 26

Expert Comment

by:Leon Fester
ID: 17008330
I've seen that same error on my server when I enabled compression after loading SP2.

Disabling the compression for request to the external network, in the General Configuration settings, seems to have resolved my issues.
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Author Comment

by:Florisvdd
ID: 17008486
I've disabled the compression for External, no diffrence, I removed all selected applications types aswell, still the same
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Accepted Solution

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Leon Fester earned 125 total points
ID: 17008894
Check the Alerts tab under the monitoring section in ISA Server Management console.

You should see the exact reason for the header being rejected.
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Author Comment

by:Florisvdd
ID: 17009640
Thank you, I see there is a patch (KB 915045) for this issue on ISA 2004 Std and Ent editions
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LVL 26

Expert Comment

by:Leon Fester
ID: 17009705
Excellent! Now I also know that :) I've been waiting for a fix, but haven't been monitoring it...
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Author Comment

by:Florisvdd
ID: 17009736
Apparently there is a re-release of this patch, not sure about the number though
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LVL 30

Expert Comment

by:ded9
ID: 17009766
okay here is a 100% resolution from microsoft

http://support.microsoft.com/?kbid=894483

Surely will resolve your issue

Reps

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