help my server fails to make logins

Hello, good evening, anyone know why the past few hours my server is no longer able to login accounts? to return to normal so restarting it :mad: ... thanks

Many have this problem, and there is no public solution

how much memory do you have at your computer?

I have 4 gb, 2 gb for the server .... there's nothing to do? Anybody know if this actulizaçao to leave the server? Thanks