Hi,
As for the firewall issues:
I did not need to set any special rules, tested the default firewall settings on 'Windows 7' and 'Windows 10' -- home LAN.
But generally:
For the Chromecast/UPnP discovery: UDP port 1900 for the multicast IP 239.255.255.250 needs to be opened
For the MM5 communication with discovered Chromecast device: TCP ports 8008 and 8009 need to be opened
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As for the multizone issues, the current sync process workflow is:
- mute all players in multizone
- wait until playback is started/buffered on all players
- seek to zero position to synchronize the players
- enable the sound to hear it all on the players
But I found that the MUTE command to Chromecast devices currently fails (it is a regression)
=> Fixed in 2162 ( item 2 in
https://www.ventismedia.com/mantis/view.php?id=15428 )