The certificate that was selected for Secure Sockets Layer (SSL) encryption could not be found in the certificate store. ...

The certificate that was selected for Secure Sockets Layer (SSL) encryption could not be found in the certificate store. To resolve this issue, use Remote Desktop Gateway Manager to either create a self-signed certificate or to select another certificate. For more information, see Obtain a Certificate for the RD Gateway Server in the Remote Desktop Gateway Manager Help.