At the end the problem was solved.
I called Marantz USA although I bought the device from Dubai, they said that the Marantz network player did not need any configuration to see the servers, so there was no more parameters left on any device that I had to configure.
I just unplugged the router and marantz network player and turned off the server. When I turned them all, there was no problem.
I was so surprized to see that no more 'not authorÄ±zed' message.
Now all the devices are working good.
Thank you again for your answers.