Error event after you customize an application to use HTTP headers in IAG 3.6 or in IAG 2007: "Headers size (xxxx) is too long.

In Whale Communications Intelligent Application Gateway (IAG) 3.6 or in Microsoft IAG 2007, an Error event that resembles the following is logged in the IAG Event Monitor:

DATETIME: [Type] HTTP [Trunk] ProductionPortal [Msg] Security Request Failed [URL] / [Method] GET [Host] [Info] Headers size (xxxx) is too long.

Note In this Error event, the DATE placeholder and the TIME placeholder represent the actual date and time. The xxxx placeholder represents the actual size of the HTTP headers.

For example, if you customize an application to use HTTP headers, and the header size is 5683 bytes, the Error event will state "Headers size (5683) is too long." Additionally, the value of the MaxAllHeadersLen property will be set to 5683.

This issue occurs because IAG limits the maximum size for all HTTP headers in a single HTTP Request or HTTP Response. By default, the maximum size for HTTP headers is 4096 bytes.

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To resolve this issue, add a registry entry and then configure it rto modify the MaxAllHeadersLen property. To do this, follow these steps:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\SOFTWARE\WhaleCom\e-Gap\Von\UrlFilter
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type MaxAllHeadersLen, and then press ENTER.
5. Double-click MaxAllHeadersLen, set the appropriate size in bytes in the Value data box, and then click OK.
6. On the File menu, click Exit.
7. Click Start, click Run, type cmd, and then click OK.
8. At the command prompt, type iisreset, and then press ENTER.
   
   Note You must reset Internet Information Services (IIS) after you add the MaxAllHeadersLen registry entry. The iisreset command-line command disconnects all existing user sessions.