windows - why "Could not load type 'System.ServiceModel.Activation.HttpModule'" happened on my server? -


i have windows server 2008 x64 r2 , worked fine after 1 month , got error:

 not load type 'system.servicemodel.activation.httpmodule' assembly   'system.servicemodel, version=3.0.0.0, culture=neutral,    publickeytoken=b77a5c561934e089'.

i found this post , run command on server , fixed issue:

c:\windows\microsoft.net\framework\v4.0.30319\aspnet_regiis.exe -iru

i never install or update on server, question why did happen?, normal or it's hack type or that?


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