Yamaha NP-S303 not working

I just got the new Yamaha NP-S303. It doesn't find the Serviio Server. It gives up searching after a few seconds. Anyone with the same problem?

Additional info:
- Message in display: [no content]
- Doesn't find foobar on Windows either
- all other devices, including Yamaha CRX-N560, work fine
- Already set "-Dserviio.advertisementDuration=5", default is 1800
- No network problems, the NP-S303's webpage can be reached, same subnet as Serviio
- Using Serviio 1.7.1.1

Thanks,
SH