Voila ce que dit le site officiel:
=========
Hamachi connects to a central server on ports 12975 and 32976 over your Internet connection using TCP. These are destination ports on our server. Since Microsoft uses random outgoing ports to connect to specified target ports, you need to configure your firewall accordingly.
The first port is used for an initial contact, and the second is used for an actual session. You can set a static UDP listening port by configuring it in Preferences > Detailed Configuration, but note that this will require you to forward that port's UDP traffic from your router to the machine, if you are behind a router. Also note that if you have multiple machines to do this on, you will need to choose different ports for each to avoid conflicts.
It also uses dynamic local and remote UDP ports for communicating with other Hamachi peers.
If the methods above fail in connecting the the Mediation Server (bibi.hamachi.cc), Hamachi will try to use standard SSL connectivity (TCP port 443) to connect to it. This will not, however, affect the UDP parts.
Hamachi also support http proxy servers, which can be configured in Hamachi Preferences > Detailed Configuration.
==========
Ce qui signifierai qu'il faille ouvrir les ports
12975, 32976 et 443 pour le TCP.
C'est donc à tester, aussi bien chez toi que chez moi aussi ou le partage de fichiers ne marche pas a cause de mon modem SpeedTouch et au Firewall intégré Universal Plug and Play. Bonne Chance Camarade de la République Démocratique Hamachiste !: