Mac (Catalina) client can't connect to Ubuntu (20.04) server for Synergy 1.13.0 pro

[David Briant 0]

Everything has installed okay and I can connect to the server from Windows 10. When I try connecting from my MacBook - screen name "MacBook" the log in the Ubuntu synergy says:

[2021-03-03T09:19:43] INFO: accepted secure socket
[2021-03-03T09:19:43] INFO: network encryption protocol: TLSv1.3
[2021-03-03T09:19:43] NOTE: accepted client connection
[2021-03-03T09:19:43] NOTE: disconnecting client "MacBook"
[2021-03-03T09:19:43] WARNING: unrecognised client name "MacBook", check server config
[2021-03-03T09:19:43] NOTE: client "MacBook" has disconnected

Any ideas on how to fix this? (I do have the client set up on the ubuntu server with screen name "MacBook"). I tried "fred" as well.