The server or daemon portion of the rsync component is configured and startup using the below commands.
$ touch /etc/rsyncd.conf
$ cygrunsrv --install rsyncd -p /cygdrive/c/cygwin/bin/rsync.exe \
-a "--daemon --no-detach" -f "Rsync daemon service" \
-u Administrator -w "thepassword"
$ cygrunsrv --start rsyncd
In some case the --start command above will fail, complaining about the login or password. In that case open the Windows Service controls and retype in the password for the rsyncd service. Then start the service again with the above command.