SharePoint 2013 error - "Application error when access /_vti_bin/client.svc"

I had been received a error message "Application error when access /_vti_bin/client.svc, Error=Path '/_vti_bin/client.svc/ProcessQuery' is forbidden" when try to add user account to a user group in SharePoint 2013 Portal .

I searched the issue in google and found out it may related to security issue in local folder  "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\ISAPI" of "/_vti_bin/client.svc".

I verified the user permission on this folder and found out that "IUSR" for IIS is not there, and so I
granted user account "IUSR" read and execute permission in this folder. I went back to try add user account in SharePoint again, and it worked successfully this time!

This issue is related to error "The server was unable to save the form at this time. Please try again." which can be resolved using above configuration. In addition, if this error still occur, check the windows features in control panel and make sure the "HTTP Activation" is selected under ".Net 3.5" and ".Net 4.5" sections.

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