OpenNos server- login connection closed

Hello, when im trying to log in to server, im getting this error
[Only registered and activated users can see links. Click Here To Register...]
When i put ID:PASSWORd its only disapear, and give me back to log in screen

EDIT: I have it on some other servers too

Does any1 know please?

The same thing happens to me, does anyone offer me help?