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An ASP website hosted in Plesk shows the error: Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly

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Kuzma Ivanov
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Plesk for Windows kb: technical ABT: Group A

Applicable to:

  • Plesk for Windows

Symptoms

The following error message appears on attempt to open a website on ASP.NET 4.0:

CONFIG_TEXT: Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Cause

ASP.NET 4 is not properly registered in Microsoft IIS.

Resolution

  1. Connect to the Plesk server via RDP.

  2. Start a command prompt as an Administrator.

  3. Re-register ASP.NET 4.0 module in IIS:

    C:\> dism.exe /Online /Enable-Feature /all /FeatureName:IIS-ASPNET4

  4. Restart IIS to apply the change:

    C:\> iisreset

  5. Repair web-server configuration for the domain:

    C:\> plesk repair web example.com

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