I got it working, but there seems to be a bug you might want to look at. I use Linux and the settings were default. The was a line in the server log samv server Starting udp server, sending to ::0.0.0.1:26719 I changed the hostname to 127.0.0.1 on both instances, and it worked correctly. It was apparently resolving "localhost" to 0.0.0.1 instead of 127.0.0.1.