Ok, so same like the avast problem you will sometimes get disconnected with F-Secure on. There is a way to fix it though, (for me at least) so all you do is just click on the F-secure program, if it doesn't work you will just have to turn on the Game mode in the Fsecure, again if it doesn't work you will have to turn off firewall/F-Secure for the game then turn it back on.
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