why i can not play league of leguend when the game star?

when I am using my internet and try to play league of leguend, at the beginning is normal, but, when the game star, the league of leguend always open a second window to play, and never load the game, you can see a message of error like you don't have internet connection.

i tried to use the cox points of internet connection and it work, but i have problems as disconnected by 10 seconds usually.

I really appreciate if any member of the cox team gives me a solution if possible.