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David Seavy User is Offline

United States
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5/22/2005

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5/28/2008 08:23 PM
SBS 2003 SP2 Premium with ISA 2004; has been running for over a year. Customer is accessing a site and filling in a form. During process of paging through form, gets this: Technical Information (for support personnel) • Error Code: 502 Proxy Error. The size of the response header Is too large. Contact your ISA Server administrator. (12216) • IP Addr : xxx.xxx.xxx.xxx • Date: 5/ 7/2008 4:25:13 PM • Server: xxxxx.xxxx.local • Source: proxy Any suggestions would be appreciated. Thanks, David

Mariette Knap User is Offline

The Netherlands
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3/24/2005

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Posts: 12894

5/28/2008 08:28 PM

David,

Check the following registry settings:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3Proxy\Parameters]
"MaxRequestHeadersSize"=dword:00032000
"MaxResponseHeadersSize"=dword:00032000

You may increase those settings if needed. As always be very careful with editing your registry. If you fail you may need to reinstall your server. Changing those settings require a restart of the ISA server services or a reboot.

Mariëtte Knap Smallbizserver.Net Administrator

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David Seavy User is Offline

United States
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5/22/2005

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5/30/2008 05:07 PM
Mariette, Thanks for the quick reply. I applied the registry change, but I still have the same problem. If I turn on monitoring in ISA Server Management, I get the following: Failed Connection Attempt [ServerName] 5/30/2008 10:51:35 AM Log type: Web Proxy (Forward) Status: 12216 The size of the response header is too large. Contact your ISA Server administrator. Rule: SBS Internet Access Rule Source: Internal ( 192.168.16.22:0) Destination: External ( 63.112.169.162:80) Request: GET http://hiring.monster.com/jobs/JobInformation.aspx?edit=true&folderID=59058481&post=true Filter information: Req ID: 1a407dda Protocol: http User: SEC\[UserName] Additional information Client agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322) Object source: Internet Processing time: 1937 Cache info: 0x2020000 MIME type: I also found the following while researching this problem: Open the gui - right-click the outbound rule that allows http Select configure http On the general tab you can amend the request headers size etc But this seems to only relate to the REQUEST headers size, not the RESPONSE headers size. I changed it anyway, but it didn't help either. Any help would be appreciated. Thanks, David

Marina Roos User is Offline

The Netherlands
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3/24/2005

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6/01/2008 11:41 PM

Hi David,

Did you restart the web proxy service?

Marina Roos Smallbizserver.Net Administrator

David Seavy User is Offline

United States
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5/22/2005

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Posts: 15

6/02/2008 03:42 PM
Yes. An then to make sure I didn't miss any service I should have restarted, I rebooted the server. While we're on the subject, which services need to be restarted to completely restart ISA?

David Seavy User is Offline

United States
Member since
5/22/2005

Platinum Membership
Posts: 15

6/04/2008 07:21 PM
I finally called Microsoft and opened a case. After a couple of days of trying this and that, MS provided a fix and the following (paraphased) information: 1. The registry patch shown above IS FOR ISA 2000 ONLY. 2. In ISA 2000 the web proxy service and Firewall service are two separate service . In ISA 2004 it is just one service. 3. There were drastic registry changes made in ISA 2004. Most importantly for this issue, the above two registry values were moved from the registry to ISA COM. 4. There is a object available through which you can set the MaxResponseHeadersSize value in ISA. The following two links provide background information: http://msdn.microsoft.com/en-us/library/ms826706.aspx http://msdn.microsoft.com/en-us/library/ms826257.aspx MS also provide the following script to set the MaxResponseHeadersSize. I followed their instructions and the problem was resolved. ' Create the root object. Dim root ' The FPCLib.FPC root object Set root = CreateObject("FPC.Root") ' Declare the other objects needed. Dim isaArray ' An FPCArray object Dim webProxy ' An FPCWebProxy object Dim restartMask ' A 32-bit bitmask of type FpcServices ' Get references to the array object ' and the Web proxy object. Set isaArray = root.GetContainingArray() Set webProxy = isaArray.ArrayPolicy.WebProxy webProxy.MaxResponseHeadersSize = 64000 restartMask = webProxy.GetServiceRestartMask webProxy.Save ' Restart the Firewall service so that ' the change will take effect. isaArray.RestartServices restartMask Save the file as test.vbs in C drive(Just an example) Go to the location through command prompt type c:\cscript test.vbs This script automatically restarts your ISA server.

Marina Roos User is Offline

The Netherlands
Member since
3/24/2005

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Posts: 12507

6/05/2008 04:44 PM

Hi David,

Glad you have got it resolved and thanks for sharing the solution!

Marina Roos Smallbizserver.Net Administrator

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