You can create a URL for RVlogin Single sign-on server, such as yourdomainname.com.

This will help you more easier access to your Single sign-on server in one domain name than going to WHM -> Plugins -> RVglobalsoft Manager -> RVlogin Manager.

WHM Single Sign-on Setting:
Go to WHM -> Plugins -> RVglobalsoft Manager -> RVlogin Manager -> WHM Single sign-on.

Use URL gateway as you want.

SSH Single Sign-on Setting:
WHM (root) -> Plugins -> RVglobalsoft Manager -> RVlogin Manager -> SSH Single sign-on.
You will see Host, Port, SSH User, SSH Password fields are already showing as your setting in for WHM.