Error message: “Cannot add the specified assembly to the global assembly cache” or “w3wp.exe unhandled exception (System.UnauthorizedAccess

The Business Connector proxy account might not have the appropriate permissions on the server to allow access. The Business Connector proxy must:
  • Be a user in Active Directory.
  • Be a member of the Power UsersIIS_WPGSTS_WPG, and the Performance Monitor Windows groups on the server that runs IIS and hosts Enterprise Portal
Create a user with domain in active directory
Also in administrative too you can find above list of members in user in that properties add the member tab Domain / user that you created as business connector proxy

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