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The request is not supported. (50) errors

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The request is not supported. (50) errors - 17.Nov.2008 11:37:20 AM

PeterGriffin

Posts: 2
Joined: 17.Nov.2008
Status: offline

Firewall specs:
-ISA2004 / SP3 (Patches are current as of 10/27/2008)
-Windows 2003 / SP2 (Patches are current as of 10/27/2008)
-ISA firewall is domain joined.
-All the traffics go through ISA firewall (2 NICs)
-Windows XP and Windows Vista Clients (All have firewall client installed and web proxy enabled).
-DNS WPAD.
-Only two ISA Networks (Internal and External)
-HTTP and FTP caching are disabled.
-HTTP compression is disabled
-DiffSrv Preference disabled

Since Friday (it could be earlier than that), users are reporting that they can't get to certain websites. I also tried to access the following sites with IE7 from my workstation with the same result:
http://www.cabelas.com
http://code.msdn.microsoft.com

I get this error message when proxy is enabled:

quote:

Technical Information (for support personnel)

* Error Code: 502 Proxy Error. The request is not supported. (50)
* IP Address: 65.55.186.117
* Date: 11/17/2008 3:22:56 PM
* Server: fw1.mycompany.local
* Source: proxy

I get this error message when proxy is disabled on the browser:

quote:

Technical Information (for support personnel)

* Error Code: 500 Internal Server Error. The request is not supported. (50)
* IP Address: 65.55.186.117
* Date: 11/17/2008 4:10:45 PM
* Server: fw1.mycompany.local
* Source: proxy

Here is the ISA log when accessing the site:

FOR: http://code.msdn.microsoft.com

quote:

Failed Connection Attempt FW1 11/17/2008 11:32:26 AM
Log type: Web Proxy (Forward)
Status: 50 The request is not supported.
Rule: Employees Outbound
Source: Internal ( 192.168.1.100:0)
Destination: External (code.msdn.microsoft.com 65.55.186.117:80)
Request: GET http://65.55.186.117/
Filter information: Req ID: 0666ece4
Protocol: http
User: mycompany\joe_cool

Additional information
* Client agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; MS-RTC LM 8; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
* Object source: Internet Processing time: 422
* Cache info: 0x2020000 MIME type:

FOR: http://www.cabelas.com

quote:

Failed Connection Attempt FW1 11/17/2008 11:13:30 AM
Log type: Web Proxy (Forward)
Status: 50 The request is not supported.
Rule: Employees Outbound
Source: Internal ( 192.168.1.100:0)
Destination: External (a72-246-124-115.deploy.akamaitechnologies.com 72.246.124.115:80)
Request: GET http://72.246.124.115/
Filter information: Req ID: 0666c87d
Protocol: http
User: mycompany\joe_cool

Additional information

* Client agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; MS-RTC LM 8; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
* Object source: Internet Processing time: 156
* Cache info: 0x236c0000 MIME type:

When I test the sites from outside the ISA firewall, I have no problem accessing the sites. So we can rule out the client and the remote server as the culprit. This is starting to become a big problem. I would really appreciate your help on this issue.

Thanks

< Message edited by PeterGriffin -- 17.Nov.2008 11:39:44 AM >

Post #: 1

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RE: The request is not supported. (50) errors - 17.Nov.2008 2:13:20 PM

Rotorblade

Posts: 1002
Joined: 27.Feb.2007
Status: offline

quote:

HTTP compression is disabled

Enable the compression filter to see if that fixes the issue.

HTH

RB

_____________________________

David Melvin
Ohio
MCSE: Security 2003, MCSA:Security 2003

(in reply to PeterGriffin)

Post #: 2

RE: The request is not supported. (50) errors - 17.Nov.2008 2:29:49 PM

PeterGriffin

Posts: 2
Joined: 17.Nov.2008
Status: offline

Thanks you!

I just enabled the compression filter. Now I can access the websites without a problem. Can you please explain what happened?

(in reply to Rotorblade)

Post #: 3

RE: The request is not supported. (50) errors - 17.Nov.2008 4:01:26 PM

Rotorblade

Posts: 1002
Joined: 27.Feb.2007
Status: offline

Well glad that fixed it.

It more likely that the site is sending compressed content even though it was not requested.

ISA SP3 includes a check that blocks compressed content from web servers when compression was not requested and the filter is disabled and is not able to decompress the response and possibly bypass the HTTP filter checks. It is also possible that you have configured and enabled network compression elements and the filter was disabled. The compression filter is a global high-level filter so decompression must occur before anything else.

Best Regards,

Dave

_____________________________

David Melvin
Ohio
MCSE: Security 2003, MCSA:Security 2003

(in reply to PeterGriffin)

Post #: 4