I realised on my way home that I should check my firewall - I have a rather paranoid firewall that blocks addresses that appear as invalid or unassigned in IANAs list, but I have noticed in the past that some ISPs appear to actually be using these....Lo and behold...cox.net is on 68.1.x.x and was being blocked.

Try now!
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Mk2a 60GB Blue. Serial 030102962 sig.mp3: File Format not Valid.