servers in a LAN can work (Left 4 Dead 2)

servers on the local network can only work with local clients (class C)


Hello, help to solve the problem, using LogMeln Hamachi has created a channel of communication between the 3 computers, 3 computers in different cities, 3 different provider.
it turns 1 computer creates, and the second mount, and same thing Vice versa.
3 but with the computer problems, this error comes if 3 the computer then generates 1 and 2, the computer does not see it.
Therese Hamachi pinged 3 comp between themselves.
Left 4 Dead 2 version of the 2150