disconnection between client and server?

disconnection between client and server?

I start server in a computer,then i want to start client application in the other computer,and the two computers connect well. i enterinto user,password,serverip,in the client ,but i can't get connection from server.i also find the client can't ping server successfully.so i close client loading windows,then the client computer can ping server computer well .from above i guess the client application makes these two computers disconnected,i don't know why this happened,please help me.thanks.

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