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I was trying to start dnscrypy-proxy on my local machine to listen on its private ip address for use in my homenetwork, but it fails to start saying listen udp 192.168.0.2:53: bind: address already in use. Running sudo lsof -P|grep :53 shows no proccess listening on port 53, and running netstat -vanp udp gives this as its output (truncated for only port 53):

Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)     rhiwat shiwat    pid   epid  state    options
udp46      0      0  *.53                   *.*                                  4096   4096  33571      0 0x0180 0x00000020

However, there is no such pid given when running sudo ps aux or scanning through the output of sudo htop. As a last resort, I tried sudo kill -15 33571, which simply replied kill: 33571: No such process. Does anyone know how I could find what is actually listening on this port?

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  • Do the answers at apple.stackexchange.com/questions/66158 help? Commented Jan 9 at 10:17
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    No, however from further testing, I suspect the issue was due to dnscrypt-proxy not shutting down properly, though after rebooting my system a few times, I can no longer reproduce the issue. Commented Jan 9 at 22:48

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