How can I unbind a UDP port that has no entry in lsof?

Posted by Chocohound on Super User See other posts from Super User or by Chocohound
Published on 2012-11-12T00:20:53Z Indexed on 2012/11/12 17:05 UTC
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On my Mac, I have a UDP port that is "already in use", but doesn't have an associated process:

sudo netstat -na | grep "udp.*\.500\>"

shows

udp4       0      0  192.168.50.181.500     *.*                               
udp4       0      0  192.168.29.166.500     *.*                               

sudo lsof doesn't show a process on port 500 (ie sudo lsof -i:500 -P reports nothing).

Note I'm using 'sudo' on both commands so it should show all processes. (rebooting works, but looking for something less disruptive)

How can I unbind port 500 so I can use it again?

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