Solved: How can I tell what process is sending packets from a particular port (udp/55613)?

[boink]

Frank, Glenn,

Thank you for the *very* quick responses (to try sockstat -46p 55613).

Actually, I had misread the source address (red face) - it's from
someone else's machine with a similar IP I didn't recognise (second
DSL was added earlier this week and a small co-hosting centre is now
routed through my place).

My humble apologies, but thank you both for the tip.

Best wishes,
boink