User add failed: Error waiting for connection: Cannot add user on this node: Could not connect

I get the following error on adding a new user

"User add failed: Error waiting for connection:
 Cannot add user on this node: Could not connect"

• Make sure the gateway port is set correctly under
  Settings->General->Miscellaneous->SSH Gateway port

• The gateway ssh port would be the port that is sshd is listening on.
  If you are running a slave cluster, make sure that sshd is listening on the same port as the master.
• Also, make sure are you able to login with the following command.

  ssh root@localhost -p<port number>