Unable to create a new subscription: The process cannot access the file because it is being used by another process

Symptoms

• When trying to create or activate a subscription in Plesk > Subscsriptions, the following error appears:

  PLESK_ERROR: Error: The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020) In Microsoft.Web.Administration module Exception type: System.IO.FileLoadException at Microsoft.Web.Administration.Interop.IAppHostMethodInstance.Execute() at Microsoft.Web.Administration.Site.Start() at IISWebSite.startStop(IISWebSite* , Boolean start) at IISWebSite.start(IISWebSite* ) at configHosting(test.tst)(WebServerAdapter::configHosting line 408) at configHosting(test.tst)(WebServerManager::configHosting line 3011) at execute console command --install-vhost(vconsoleapp::start line 100) at execute "C:\Program Files (x86)\Parallels\Plesk\admin\bin64\websrvmng.exe" --install-vhost "--vhost-config=tmpECEB.tmp"(vconsoleapp::run line 116) (Error code 1)

• The following error can be found in %plesk_dir%\admin\logs\php_error.log :

  CONFIG_TEXT: ERR [panel] Could not open socket

Cause

Another service is listening to TCP port 80 or 443.

Resolution

1. Connect to the server via RDP.

2. Find a service that is listening to TCP port 80 or 443:

   C:\> netstat -aon | findstr -i ":80 :443" | find "LISTENING"
   TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 16281
   TCP 0.0.0.0:8090 0.0.0.0:0 LISTENING 16281
   TCP 0.0.0.0:443 0.0.0.0:0 LISTENING 16281
   TCP [::]:443 [::]:0 LISTENING 16281

3. Use Windows Task Manager to determine the service by its PID (PID 16281 in the example above).

4. Stop the service using Windows Task Manager.