The Player Portfolio System has the ability to drill into a firmware page that exists within each of the zone players. This page houses specific diagnostic tools that can be very useful for troubleshooting.
System Diagnostics Tools:
There are several tools to look at within the System Diagnostics. Three of them are specifically highlighted here as being especially useful to troubleshooting network and zone communication issues.
To get to the site, open a browser and type the zone's IP address into the address pane and /diagnostics.fcgi, ie. 192.168.1.110/diagnostics.fcgi. This will open the diagnostic window.