Background :
if your SharePoint 2013 Web application is Claim Based Authentication and you are getting this error while accessing any sites in this Web application
Error in Event Viewer : Task Category : Claims Authentication
Description :
An exception occurred when trying to establish endpoint for context: An error occurred loading a configuration file: Either a required impersonation level was not provided, or the provided impersonation level is invalid.
Root Cause:
The Application pool account was missing the ‘Impersonate a client after authentication’ user right.
Work Around :
Step 1. Go to Start – Administrative tools – Local Security Policy – Local Policies – User Right Assignments – Impersonate a client after authentication – Properties
Step 2. Add the Application Pool account for the site which is not working(Click on Add user or group)
Step 3. Reboot the server
Step 4. Check again the site, It will work.
if your SharePoint 2013 Web application is Claim Based Authentication and you are getting this error while accessing any sites in this Web application
Error in Event Viewer : Task Category : Claims Authentication
Description :
An exception occurred when trying to establish endpoint for context: An error occurred loading a configuration file: Either a required impersonation level was not provided, or the provided impersonation level is invalid.
Root Cause:
The Application pool account was missing the ‘Impersonate a client after authentication’ user right.
Work Around :
Step 1. Go to Start – Administrative tools – Local Security Policy – Local Policies – User Right Assignments – Impersonate a client after authentication – Properties
Step 2. Add the Application Pool account for the site which is not working(Click on Add user or group)
Step 3. Reboot the server
Step 4. Check again the site, It will work.
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