188.8.131.52:8000 doesn't resolve to a valid server.
that means either the DNAS server is not running
you have not got the correct details
you've not opened port 8000 from the machine running the DNAS server on (is not clear if you're self-hosting of using a host provider) and the Internet. unless the DNAS can be seen, no one is going to be able to connect to it.
if you can confirm the DNAS is running, then i would suggest having a look at http://wiki.winamp.com/wiki/SHOUTcast_YP_Nak_Errors
about how to find the way to open ports (assuming you are self-hosting).
if this is an issue via a hosted setup, then you need to get them to help you out as most likely you won't be able to resolve things on your own.