I am using a SSH tunneling service like ngrok to expose my sites to the internet rather than directly opening up ports 80 and 443 from my server’s internet gateway router.
However, cerbot now fails to complete the re-certification.
sudo certbot renew --dry-run
Attempting to renew cert (algominier.com) from /etc/letsencrypt/renewal/algomini er.com.conf produced an unexpected error: Failed authorization procedure. algomi nier.com (http-01): urn:ietf:params:acme:error:connection :: The server could no t connect to the client to verify the domain :: Fetching http://algominier.com/. well-known/acme-challenge/U_6JbPkihWAEkXnqJCRjxuuZzSscqWlEW7TV61j76xs: Timeout d uring connect (likely firewall problem). Skipping.
What is the solution for this?