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You can use iptables: sudo iptables -t nat -A PREROUTING -p tcp --dport 22 -j REDIRECT --to-port 2222
sudo iptables -t nat -A PREROUTING -p tcp --dport 22 -j REDIRECT --to-port 2222
If running on Windows, port 22 is usually free and it's ok to run kippo on that port.
On linux, port 22 is restricted for root only, except if you do this (quote from #twisted):
<ivan> at least on linux, setcap 'cap_net_bind_service=+ep' /path/to/program