Which ports and protocols does Hamachi use?
Hamachi uses several ports to achieve connectivity to the mediation servers, and to peers. Read this article if you have a good understanding of ports and transport protocols.
Server Connectivity
- TCP 12975 (initiator port)
- TCP 32976 (session port)
If the above ports cannot be used to establish a connection, Hamachi will try again using SSL (TCP 443).
Peer Connectivity
Peer connectivity has several methods and ports. By default, Hamachi will broker a peer connection over UDP. UDP uses random ports by specification, so it is not possible to open a single port for peer connections for UDP.
If UDP direct connectivity cannot be established, Hamachi will try to initiate a relayed UDP connection. This is done with the target of:
- UDP 17771 (relay connection port)
If UDP direct and relayed methods fail, it is unlikely that TCP connectivity will work. In some environments, a hardware firewall is used to block traffic on specific ports, but not protocols. As such, Hamachi will try to broker a connection between peers over TCP 443 (non-SSL)
And lastly, Hamachi will try a relayed connection over TCP 443 (non-SSL) before giving the user a message that the peer is unreachable.
Additional Information
You can set a static UDP listening port and TCP handshake port by configuring it in under Peer Connections. Complete both values if you have multiple Internet connections.