Hamachi:Firewall:General
From LogMeInWiki
Since Hamachi uses UDP traffic to create the peer to peer tunnels, some environments may be difficult to get Hamachi connected between peers.
In cases where you are in a very restricted environment, having UDP 17771 Outbound allowed on the firewall will allow the machines inside the firewall to get a relayed connection to the mediation server (and thus peers).
Since UDP is locally a random protocol controlled by the operating system, the only other way to allow only a single port for the direct peer to peer connectivity is to set a static port on the other peer(s) and allow that port outbound on the firewall.