Do you have a DNAS (SHOUTcast server) installed?
If so, did you change the DNAS variables srcIP and destIP from ANY?
Is your DNAS and Winamp/DSP combo on the same machine?
What exactly are you entering for "Address" and "Port" in the DSP?
snapman.. Please don't hijack threads. Please search the forums for an answer to your problem, then post a thread of your own if a fix isn't found.