new user: album art, audio files

[simoncn]

Have you installed BubbleUPnP Server on the Rendu, on the Mac or on your NAS? Which firewall do you think might be blocking Java?

Edit: If you have installed BubbleUPnP Server on the Rendu and if BubbleUPnP Server is producing the message about a conectivity read timeout and if the Synology firewall is enabled, it is possible that the Synology firewall might be blocking inbound HTTP connections to MinimServer. In this case, you need to change the settings in the Synology firewall to enable inbound connections to UDP port 1900 and TCP ports 9790 and 9791. You can do this by creating a firewall rule and selecting the settings for Built-in Applications > MinimServer UPnP media server.