Cobra Forum

Question:
Plesk and websites are not accessible: 500.19 - Internal server error - Module DynamicCompressionModule
Symptoms

• Plesk and websites are not accessible on localhost with one of the following error messages:

500 Internal Server Error
HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.
Detailed Error Information:
Module DynamicCompressionModule
...
Error Code 0x8007007e
Note: Error code can also be 0x80070005.

• The following error message may appear in %plesk_dir%admin\logs\php_error

ERR [panel] Could not ping database connection: Unable to get PSADb administrator password: The system cannot find the file specified. (Error code 2) at Unable to connect to pipe ...
Cause
The file %windir%\system32\inetsrv\config\ApplicationHost.config refers to a compression scheme that is not properly configured.

Resolution
1.Connect to the Plesk server via RDP.

2.Start a Command Prompt as an Administrator.

3.Run the following command to locate the module reference that is invalid. In the example below, the faulty module is "xpress":
c;\>%windir%\system32\inetsrv\appcmd.exe list config -section:system.webServer/httpCompression | findstr "dll"

<scheme name="br" dll="%ProgramFiles%\IIS\IIS Compression\iisbrotli.dll" />
<scheme name="gzip" dll="%ProgramFiles%\IIS\IIS Compression\iiszlib.dll" />
<scheme name="xpress" doStaticCompression="false" doDynamicCompression="true" dll="C:\Program Files\WSUS\Services\WebServices\suscomp.dll" staticCompressionLevel="10" dynamicCompressionLevel="0" />
4.Create a backup file of IIS configuration:

c:\>%windir%\system32\inetsrv\appcmd.exe add backup BeforeEditBackup
5.Remove the XPress compression scheme from IIS configuration:

c:\>%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-[name='xpress']
6.Open the file %windir%\system32\inetsrv\config\ApplicationHost.config in a text editor and search for the line with the scheme name:

xpress scheme <scheme name="xpress" doStaticCompression=... />
7.If it exists, remove the line and save the changes.

Restart IIS:

c:\>iisreset