Password Manager site is not loading and the following error is occurring: “could not load type system.servicemodel.activation.httpmodule…” (179513)

Password Manager site is not loading and the following error is occurring: “could not load type system.servicemodel.activation.httpmodule…”

Password Manager site is not loading and the following error is occurring:

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

The error is caused by an incomplete .NET 4 installation, or IIS role was installed after .NET 4 or the service account's password has changed and service cannot be started.

WORKAROUND

The resolution is to register .net by the following steps:
a)  Open a command prompt with administrator rights
b)  Type the following command:
c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -iru
c)  Perform iisreset

Here is an Microsoft article on the solution.

2. Verify the QPM application service is started in services.msc