as i mentioned yesterday, i haven't looked as yet into the connection refused issue. In the interim, make sure you have "wifi sync" ticked in the device preferences, MB is running and also that you have responded to the windows firewall prompt to allow MB access to your private network (or any other firewall software you might be using)
REPORT UPDATE FYI
Updated latest patch MB Portable v3.3.6986 = YES
Updated Sync App from Play Store? = YES
MusicBee running? = YES
Wifi sync ticked in device prefs? = YES
Not seen any "windows firewall prompts", however TWO instances of 'musicbee.exe' have been ALLOWED on Private AND Public networks.
No other AV or Malaware Bytes software installed..
Error log - similar to earlier report..
Hope this helps - Freddy