My friend can not play a game of shellshock because right whenever he joins a game he crashes. I don't know why.
Tell him to restart his internet or pc... Otherwise, trying a different browser may work. The worst that could happen is he has a virus...
Tell him to restart his ethernet or wifi if he knows how to do that... Otherwise, SSL's servers are bad atm, and it may take some time for them to get better...
Sometimes unplugging the Internet modem and plugging back in works. I only do that if my internet isn't working though which is rarely.