Hamachi Relayed Tunnel problems ?

Hi, 
I'm trying to get of a fix for friend of mine about this hamachi or something of a problem. Apperantly he can connect to game, but as it loads he shortly cuts out for no reason, and the console says connection lost, nothing more to it.. Hamachi shows a blue dot on him, but it connects us tho, i ping him and I get them back at around 120-100ms with a few time outs.. So what we tried to get the blue dot away but no luck.. 

So could this be a hamachi problem or something way other? Since it connects but loses connection