[HELP] Server Error

Hello
if someone could help me ,

In my server when there are around
25+ persons connected
nobody can do login
and when the connected person get disconnected
they can´t login too

and i get a strange message in virtual machine

can someone help me plz :confused:

Is Portmap on?

Yes is on

The problem is
after aroud 20 persons in game,
the people that are not logged
cant login