After re-installing of .NET 4 Framwork, all application pools in IIS have been switched to .NET 2

Created:

2016-12-12 03:47:57 UTC

Modified:

2017-08-08 13:39:05 UTC

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After re-installing of .NET 4 Framwork, all application pools in IIS have been switched to .NET 2

Applicable to:

  • Plesk 12.5 for Windows

Symptoms

After re-installing of .NET 4 Framwork a lot of websites are not accessible

Cause

.NET version for websites application pools has been switched from 4.0 to 2.0

Resolution

  1. Go to IIS > Application Pools > example.com (domain)(4.0)(pool)
  2. Edit Basic Settings for the pool and switch it back to .NET 4

If there is a big number of affected application pools, it is possible to develop the script to switch all of them at once using Microsoft Technet article - Specify a .NET Framework Version for an Application Pool (IIS 7)

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