Help Error !

I have a big problem, my server is kicked players, giving the message that unable to connect and LoginOverTime!
Does anyone have idea where is the problem.
He was running normally, this happened after I changed the drop of the boss...

Did you portforward? and allow Accountserver in Antivirus. And close Firewall.

thats is not firewall dude..just try changed back the query maybe u made something worng with query then try restart back ur server