yp.shoutcast.com gave error (nak)

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<04/23/13@04:22:41> [yp_add] yp.shoutcast.com gave error (nak) <04/23/13@04:22:41> [yp_add] yp.shoutcast.com gave extended error (Cannot see your station/computer (URL: http://IP:PORT) from the Internet, disable Internet Sharing/NAT/firewall/ISP cache - see http://wiki.winamp.com/wiki/SHOUTcast_YP_Nak_Errors [480])

Anyone have any clue what his error is?  This has just happened today on 2 different servers.
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