Connecting Client - not happening

sputnik18

Citizen
Hi. I have downloaded ServOU from Github, updated the data path config and compiled OK. The server is listening on 127.0.0.1.
I have also downloaded current classic client (7.0.90.16) and running with Razor to 127.0.0.1 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?