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Comment by guytv | Hacker News Reader

Catalina: getting "failed to listen" when running non-root, Shows empty panels when ran with sudo.

You can run as non-root by using setcap to give extra capabilites to the binary:

  sudo setcap cap_net_raw,cap_net_admin=eip <path_to_what_binary>

setcap is Linux-specific thing. Doesn't exist on freebsd, darwin(macosx) or any other unix.