Network Communications
TCP/IP communications (default port 24800) are used to send mouse/keyboard and clipboard events between computers. Communications are not encrypted, and key presses, mouse movements, and clipboard contents sent to Synergy clients can be easily sniffed on network traffic.
It is recommended that if Synergy is not being used on a trusted local network, that all communications be tunneled through a secure encrypted connection, such as through SSH, stunnel, or a VPN. In this model, the Synergy server computer needs to be running an SSH server, and the Synergy process should be configured to listen only on localhost. To get an SSH server, Macintosh users can enable Remote Access, Linux users can enable sshd, and Windows users can configure an SSH server through Cygwin. Synergy clients would then execute a command similar to "ssh -L 24800:localhost:24800 user@synergyserver" before connecting the synergy client to localhost.
Read more about this topic: Synergy (software)
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