Synergy 1.3.7: server refused client with our name

The problem is with the hyphen. I was facing the same issue. When I removed the '-' from the client configuration's screen name and from the host's server configuration screen name. It worked.

The problem was with the server screen name, "Rupert-PC". By using "rupert" instead, synergy worked fine.

This may either be a problem with capitalisation or the hyphen.