Network Player Series MSS500/550 User Manual V1.8
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Troubleshooting Step 3: Disable another wireless/wire network card
If the connection is established, but you still can not update the play list. In
this case, chances are there are more than one network adaptor cards in you
PC host.
Try to disable the others, only enable the one that is connected to the client
unit, then ping the client unit again to be sure that the connection is
established. The update service should bind to only one network card (IP).
You could get the information (Base URL) from MSO windows title. Make
sure the Base URL and client IP can connect to each other.