Website at Plesk shows HTTP Error 500.21: Handler “aspNetCore” has a bad module “AspNetCoreModuleV2”

Symptoms

• Website hosted at Plesk or Websites & Domains > example.com > Website Preview shows the following error:

  HTTP Error 500.21 - Internal Server Error
  Handler "aspNetCore" has a bad module "AspNetCoreModuleV2" in its module list

• After starting the Failed Requests Tracing in Plesk at Domains > example.com, the following traces can be found:

  Warning -MODULE_SET_RESPONSE_ERROR_STATUS
  ModuleName AspNetCoreModuleV2
  Notification EXECUTE_REQUEST_HANDLER
  HttpStatus 500
  HttpReason Internal Server Error
  HttpSubStatus 0
  ErrorCode The operation completed successfully.

Cause

Missing .Net Core version 2.2 required.

Resolution

1. Connect to the server via RDP.

2. Install the required version 2.2 manually using the installer downloaded from the .NET Core website.

Additional step that helped in particular case: set the Let’s encrypt certificate in Hosting Settings of the domain: