When I want to login to our private server (89.163.135.125:2300) , I have a light blue screen or a white screen. The server log says that I am online, but there are no errors or something like that. After 10-20 minutes with this screen ( I am unable to play ) I will be kicked because of high ping.
A friend of mine has the same problem on another private server and he got a light purple screen.
We can normally login to public servers.