Version 2

    Windows Services

    Remote Desktop Configuration

    Remote Desktop Gateway

    Remote Desktop Services

    Remote Desktop Services UserMode Port Redirector

     

    Terminal Services Gateway Performance Counters

    Connection request authorization timeShows the average connection request authentication and authorization times in seconds.
    Current connectionsShows the total number of active/inactive connections to the RDG server at any given moment.
    Failed Connection AuthorizationShows the total number of requests that failed due to insufficient connection authorization privilege.
    Failed connectionsShows the number of connection requests that are all failed due to errors and authorization failure
    Failed Resource AuthorizationShows the total number of requests that failed due to insufficient resource authorization privilege.
    Successful connectionsShows the number of requests that were successfully processed and connected

     

    Events: RD Gateway Server Connection Errors

    Log: System

    Source: Microsoft-Windows-TerminalServices-Gateway

    Event IDs: 201,203,204,301,305,306,308,311,1001

     

    Event Logs taken from RD Gateway Server Connections | Microsoft Docs