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ISA Error Code 502 Proxy Error

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ISA Error Code 502 Proxy Error - 12.Jun.2007 1:46:22 AM   
jacod@naledi.com

 

Posts: 1
Joined: 12.Jun.2007
Status: offline
Hello  all,

We are running ISA Server 2006 Enterprise.  All users use web proxy on port 8080 to browse the Internet from the Internal LAN.  Our users can succesfully browse the Internet except when they want to access one specific web site.  The web site is:

http://www.dataviz.com/downloads/demo/index.html?product=RDS

When they access the web site, the following ISA error is displayed:

Error Code: 502 Proxy Error. The HTTP message includes an unsupported header or an unsupported combination of headers. (12156)

Is there something we can do on our side to give access to the specific web site?

Thank you.
Post #: 1
RE: ISA Error Code 502 Proxy Error - 13.Jun.2007 5:33:22 PM   
Yorgy

 

Posts: 158
Joined: 20.Sep.2006
Status: offline
You may want to look over this KB from Microsoft and consult with them to see if there is a Hot Fix available for 2006. The KB only applies to 2004 with the issue you are experiencing.

http://support.microsoft.com/kb/915045/

Yorgy

_____________________________

Life is a zoo in a jungle!

(in reply to jacod@naledi.com)
Post #: 2
RE: ISA Error Code 502 Proxy Error - 25.Jun.2007 7:22:21 AM   
Johan_A

 

Posts: 1
Joined: 27.Apr.2005
From: Sweden
Status: offline
We got the same error when we try to access http://www.esmaker.net/nx2/
Running ISA 2006 STD.
http://www.dataviz.com/downloads/demo/index.html?product=RDS  dosent work for us either.
Yorgy have you fix the problem?


/Johan

(in reply to jacod@naledi.com)
Post #: 3
RE: ISA Error Code 502 Proxy Error - 27.Jun.2007 12:31:49 PM   
SFletchall

 

Posts: 2
Joined: 27.Jun.2007
Status: offline
How about http://www.gamedev.net/community/forums/themes/theme1/theme.asp

How about http://www.wellmark.com  ?

Now, how about https://www.wellmark.com  (notice httpS)

Now try https://www.dataviz.com/downloads/demo/index.html?product=RDS (notice httpS)

I believe you're experiencing this issue:

http://support.microsoft.com/kb/935882/
 
This is serious enough IMHO for M$ to release this in a patch all by itself.  Why are they waiting for the next Service Pack to add this hotfix?  Perhaps they're still testing it.  Anyway, you can call the technical support number at http://support.microsoft.com/oas/default.aspx?ln=en-us&c1=10750&prid=10430&gprid=455046 and receive this hotfix free of charge.  They will warn about using this in a production environment, so I would recommend caution... although I personally installed this hotfix w/o testing it. (We have a backup ISA server [2004] that I can quickly switch over too, so I wasn't concerned).

All right, now after installing this hotfix, nothing changed… at first.  A little while later www.wellmark.com and www.esmaker.net/nx2 worked, but the other sites still do not (http://www.dataviz.com/downloads/demo/index.html?product=RDS and http://www.gamedev.net/community/forums/themes/theme1/theme.asp).

Perhaps this is due to caching?  I even disabled caching, restarted the server and re-enabled caching and still no luck.  At any rate... my problems are solved as wellmark works :).  Good luck.  Please let me know how you fix it.
 
Here's an older thread with the same issue:
http://forums.isaserver.org/ISA_Server_2006_messes_up_display/m_2002024483/tm.htm
 
Also, one more thing.  I wonder if our firewall might be stripping certain information from these sites that isa2006 wants to see.  Perhaps I will test that and let you know.

< Message edited by SFletchall -- 27.Jun.2007 12:38:27 PM >

(in reply to Johan_A)
Post #: 4
RE: ISA Error Code 502 Proxy Error - 29.Jun.2007 6:30:03 AM   
Mylle

 

Posts: 39
Joined: 28.Apr.2004
From: Denmark
Status: offline
Hello

I have the exact same problem. Called Microsodt for the fix. installed it, but it is still not working :(

Any ideas?

Jacob

(in reply to SFletchall)
Post #: 5
RE: ISA Error Code 502 Proxy Error - 31.Jul.2007 11:37:30 AM   
tchescat

 

Posts: 14
Joined: 22.May2003
Status: offline
The hotfix worked for me!  All the sites that you've listed did not work for me before the hotfix and now they work.  The secret for me was the Reg entry that needs to be put in before the hotfix works!!!

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAT\Stingray\Debug\Web Filters]
"DROP_CONTINUATION_LINES"=dword:00000001

I needed to type that reg in manually, but it worked!!!!!!!!!!!!!!!!!!!!!

(in reply to Mylle)
Post #: 6
RE: ISA Error Code 502 Proxy Error - 16.Aug.2007 3:56:06 AM   
Sauron76

 

Posts: 5
Joined: 15.Aug.2007
Status: offline
Dear Guys,
I want to replace my old ISA 2000 server with new ISA 2006. My ISA2006 joins an enterprise domain & all users will have to key-in their domain id in order to surf through proxy. But the problem is certain users when trying to surf, their is no authentication box appear instead of this error msg.

Error Code: 502 Proxy Error. The ISA Server denied the specified Uniform Resource Locator (URL). (12202)


 I tried install hotfix that were given in Microsoft websites/engineer but the problem still happens. Need your guys expertise to help me solve this problem. Currently i've revert back to my old ISA 2000 server which has never encountered this kind of problem.

(in reply to tchescat)
Post #: 7
RE: ISA Error Code 502 Proxy Error - 14.Nov.2007 8:25:35 PM   
jdmils

 

Posts: 94
Joined: 25.Jan.2006
Status: offline
The error:

The HTTP message includes an unsupported header or an unsupported combination of headers

Is due to a new feature (???) which is introduced by ISA Server 2006.
This problem occurs if a Web server response contains an HTTP header that begins with a space or with a TAB character.

The intended resolution is to obtain the hotfix KB935882 which M$ will send to you. I tried installing the hotfix and kept getting the error:

Internal Error 2727. FBA_SET_ISA_XHTML_NLS_ZHTW

I found a post at http://www.bibble-it.com/2007/10/18/isa-server-2006-update-error-fba_set_isa_xhtml_nls_zhtw which stated that the poster had the same error and found that it was due to kb939455 already being installed on the server.

I thus uninstalled kb939455 and installed KB935882 and it installed without error!

But the hotfix did NOT solve the problem. What I did find was this.....

I used the address:

http://10.16.1.41/cms/ioRD.asp?Action=ShowLoginMask&LngId=ENG

to access the internal web server. The IE7 browser gives me the error:

quote:

X Network Access Message: The page cannot be displayed

Explanation: There is a problem with the page you are trying to reach and it cannot be displayed.

....
....
Technical Information (for support personnel) Error Code: 502 Proxy Error. The HTTP message includes an unsupported header or an unsupported combination of headers. (12156) IP Address: 10.16.1.41 Date: 11/15/2007 12:47:31 AM [GMT] Server: cla-isa.scl.signet.com.au Source: proxy

Using FireFox V2.0.0.9 works fine and gives me the page I'm after.

However, if I replace the IP "10.16.1.41" with the host name "crs-cm", IE7 works fine! The same goes for IE6. And I have tested this on more than one workstation. This was not a problem when we were using ISA Server 2004.

This problem occurrs on our ISA Server CLA-ISA (10.3.0.48) V5.0.5721.240. Interestingly, the problem is not apparent when the user is using our second ISA Server CRS-ISA (10.16.1.100) V5.0.5721.240. The web server is local to the CRS-ISA server.

CLA-ISA & CRS-ISA Internal Network addressing:
quote:

10.0.0.0 to 10.255.255.255
172.16.0.0 to 172.31.255.255
192.168.0.0 to 192.168.255.255


Anyone know what's happening here??

_____________________________

|
+-- JDMils
|
+-- Windows 2003 Server DC
+-- Windows 2003 Server hosting ISA 2006 Stnd SP2
|

(in reply to Sauron76)
Post #: 8
RE: ISA Error Code 502 Proxy Error - 16.Nov.2007 10:21:16 AM   
elmajdal

 

Posts: 6022
Joined: 16.Sep.2004
From: Lebanese in Kuwait
Status: offline
Hi Guys,

for the 502 error , install the ISA Server 2006 Supportability Update package  http://support.microsoft.com/?kbid=939455

make sure to read the List of issues that this package fixes

_____________________________

Tarek Majdalani

Windows Expert - IT Pro MVP
Facebook : https://www.facebook.com/ElMajdal.Net

(in reply to jdmils)
Post #: 9
RE: ISA Error Code 502 Proxy Error - 16.Oct.2008 10:13:50 AM   
tjcarst

 

Posts: 184
Joined: 6.May2004
From: Lincoln, NE
Status: offline
I have the same problem with http://communityccrx.com/individuals/look_up_drugs

I can access the site with Firefox, but not IE.

Error Code: 502 Proxy Error. The HTTP message includes an unsupported header or an unsupported combination of headers. (12156)

I have installed the supportability patch, no luck.

I've requested kb 935882 from MS, but haven't received yet.

(in reply to elmajdal)
Post #: 10
RE: ISA Error Code 502 Proxy Error - 16.Oct.2008 1:32:21 PM   
tjcarst

 

Posts: 184
Joined: 6.May2004
From: Lincoln, NE
Status: offline
935882 didn't fix the problem either...

(in reply to tjcarst)
Post #: 11
RE: ISA Error Code 502 Proxy Error - 16.Oct.2008 5:17:15 PM   
tjcarst

 

Posts: 184
Joined: 6.May2004
From: Lincoln, NE
Status: offline
Correction - If Firefox is set to use the ISA 2006 server, the site fails.  The client succeeds if the Firefox browser uses the Fireall Client to access the site when there are not proxy settings configured.

In IE7, the client uses the web proxy even though the site is configured to bypass the proxy client on the ISA server.

(in reply to tjcarst)
Post #: 12
RE: ISA Error Code 502 Proxy Error - 16.Oct.2008 5:33:24 PM   
tjcarst

 

Posts: 184
Joined: 6.May2004
From: Lincoln, NE
Status: offline
I've found a fix, though not pleased with it.

Install Firewall Client.  Do not enable web browser auto config. 

Set IE Tools, Internet Connections, LAN Settings, Advanced, Do not use proxy server for addresses beginning with *.<domain name> of problem site.

The Client does not pay any attention to the Web Proxy exclusion specified on ISA server for bypassying the domains in Config, Networks, Internal, Web Proxy, Directly Access these servers or domains.

(in reply to tjcarst)
Post #: 13

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