When you are installing WSUS, you can choose either installing WSUS on the Default Web Site or on a new Web Site.
The Scenario: Windows server 2008 R2 x64 with IIS 7.5, Default Web Site already has some Application deployed.
Ok, so your “dedicated” WSUS server already got some IIS application on it and yet, what with WSUS ? well.. you can choose in the wizard to install the WSUS on a new site with other port then the default 80 – port 8530 .
Everything goes fine and the WSUS is working perfectly. Oops – we have a problem ! – the application in the Default Web Site is not working anymore.
When you browse to the application you get Error 500.19 with the following details:
HTTP Error 500.19 – Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid. Module DynamicCompressionModule
Error Code 0x8007007e
Requested URL http://localhost:80/
Physical Path <some Path>
Logon Method Anonymous
Logon User Anonymous
To resolve this situation, review the ApplicationHost.config (locate it in under C:\windows\inetsrv\config). In the ApplicationHost.config find these lines :
<scheme name=”xpress” doStaticCompression=”false” doDynamicCompression=”true”
Found it ? okay, it’s time to deal the situation. run this executable with the following parameters: %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-[name='xpress']
This command will disable the suscomp.dll which is being installed by the WSUS. the compression schemes are defined globally and loaded in every application Pool. when WSUS x64 register this dll it will result this error when x64 version of suscomp.dll attempts to load in an application pool which is running in x32 mode.
If, from some any reason you want to enable the compression again, run this command : %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+[name='xpress',doStaticCompression='false',dll='%windir%\system32\inetsrv\suscomp.dll']