- Plesk for Windows
When creating a new domain or updating domain's hosting settings, the operation fails with:
PLESK_ERROR: Error: Unable to turn on ASP.NET version 4.x because it is not installed.
ASP.NET 4.x version is not listed in Plesk components. This error may occur when a higher version of ASP.NET was installed previously, but was removed later.
Go to Tools & Settings > Server Components and click Refresh.