The Remote Desktop Gateway service does not have sufficient permissions to access the Secure Sockets Layer (SSL) certificate ...

The Remote Desktop Gateway service does not have sufficient permissions to access the Secure Sockets Layer (SSL) certificate that is required to accept connections. To resolve this issue, bind (map) a valid SSL certificate by using RD Gateway Manager. For more information, see "Obtain a certificate for the RD Gateway server" in the RD Gateway Help. The following error occurred: "%2".