Hosting ASP.NET MVC application on IIS web server using Windows 2019 server

Question

[The requested page cannot be accessed because the related configuration data for the page is invalid.]

HTTP Error 500.19 - Internal Server Error

• The requested page cannot be accessed because the related configuration data for the page is invalid.

Most likely causes:

• The worker process is unable to read the applicationhost.config or web.config file.
• There is malformed XML in the applicationhost.config or web.config file.
• The server cannot access the applicationhost.config or web.config file because of incorrect NTFS permissions.

Detailed Error Information:

• Module DynamicCompressionModule
• Notification SendResponse
• Handler ExtensionlessUrlHandler-Integrated-4.0
• Error Code 0x8007007e
• Physical Path :
• Logon Method Anonymous
• Logon User Anonymous

(https://i.stack.imgur.com/WAYGn.png)

Even after giving all the permission, application is not running and I am getting the same error everytime as attached with screenshot. I am not able to host it on iis web server using windows 2019 server

Answer 1

The error code 0x8007007e translates as ERROR_MOD_NOT_FOUND (i.e. the specified ‘DynamicCompressionModule’ could not be found).

When WSUS is installed, it adds the XPress compression scheme module (suscomp.dll) into IIS. In IIS, Compression Schemes are defined globally and so will attempt to load in every application pool within IIS. As such, it will kick out this error when the 64bit version of suscomp.dll attempts to load in an application pool which is running in 32bit mode.

Fix:
Disable the XPress compression scheme that was introduced by WSUS from the configuration using the command below:

%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-[name='xpress']

Running the above command in my 'Command prompt' fixed the issue.