1. Launch the "RD Gateway Manager", expand the server, e.g. "rdg.opensid.net". 
2. Right click "Properties", select "SSL Certificate" tab.  
   
   There are three ways to install a certificate. Make sure that the certificate is issued to the gateway's external domain name, i.e. "rdgateway.deepnetsecurity.com". 
   
   
   Note: If you are using the self-signed certificate, the certificate has to be installed as a trusted root CA certificate on client machines where the remote desktop client is running.