sudo certbot renew --force-renewal
First attempt : failed
I had to poke a hole in the router for port 80, apparently certbot is designed to use this port and nothing else (for this renewal method) if I understand it right. After that it worked fine:
luc@kid2:~$ sudo certbot renew --force-renewal
Saving debug log to /var/log/letsencrypt/letsencrypt.log
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Processing /etc/letsencrypt/renewal/tuxic.dedyn.io.conf
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Renewing an existing certificate for tuxic.dedyn.io
Reloading apache server after certificate renewal
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Congratulations, all renewals succeeded:
/etc/letsencrypt/live/tuxic.dedyn.io/fullchain.pem (success)
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