Connecting Client - not happening


Hi. I have downloaded ServOU from Github, updated the data path config and compiled OK. The server is listening on
I have also downloaded current classic client ( and running with Razor to port 2593. The client logon shows Powered by Razor, the UO version number with patch unknown after it. When I tried to login with the admin account I set up I get the message unable to authenticate. Also the server does not show any connection attempt message.
I presume I'm missing something obvious?