dwiosize. window dissepear

help me please. I have mu server 1.02n hosted vps server. and when I enter game mu game window just disappear, without "you are disconnected" and etc. I check gameserver log files.

Code:

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01:23:35 connect : [6401][127.0.0.1]
Connection Closed, dwIoSize == 0 (Index:6401)
01:24:01 (6401)logout :  [127.0.0.1]
01:24:48 connect : [6402][127.0.0.1]
Connection Closed, dwIoSize == 0 (Index:6402)
01:25:11 (6402)logout :  [127.0.0.1]
01:25:12 connect : [6403][127.0.0.1]
Connection Closed, dwIoSize == 0 (Index:6403)
01:25:18 (6403)logout :  [127.0.0.1]

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I can't understand how to fix this. I searched all the internet and cant find solve. please help.

IP you use on your client ?

I use this IP for client. 178.218.210.*** <<< the IP of the server. sometimes I enter in game with no problem, but in 2-3 minutes it closes.

maybe your AV is closing it :-?