[linsomniac]

Yes, the versions between client and server do need to be in lock-step. As far as needing to be in the system default path, I haven't run into that: when I initially started using it, I had dropped the executable into ~/bin and that seemed to work (that is in my shell path).

[KolenCh]

It depends how the rc files are initialized though. I remember last I check I couldn’t get it work on one system (that I don’t have control over those in /etc and those set in my home is not initialized at that stage.)

Mosh implemented a flag to include in the client side: —server=… which solves this problem.