title: how to renew an expired "let's encrypt" certificate?
body: <p>I am "newbie" I installed a "nginx" and "https" with this tutorial:
  <a href="https://www.supinfo.com/articles/single/3558-installer-certificat-ssl-nginx-avec-let-s-encrypt" rel="nofollow noreferrer">https://www.supinfo.com/articles/single/3558-installer-certificat-ssl-nginx-avec-let-s-encrypt</a>.</p>
  
  <p>my domains worked well and were accessible in https but I turned off my server too long and left the certificate expired.</p>
  
  <p>now I can not renew my certificates because the command line does not work if the certificate has expired how to do it? Thank you</p>
  
  <p>the error message</p>
  
  <p>Attempting to renew cert from /etc/letsencrypt/renewal/info.fr.conf produced an unexpected error: Failed authorization procedure. info.fr (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching <a href="http://info.fr/.well-known/acme-challenge/PwznYVREcdpBsSMDPhP_lp3s1bqbidN83z1lyNXm3Yc" rel="nofollow noreferrer">http://info.fr/.well-known/acme-challenge/PwznYVREcdpBsSMDPhP_lp3s1bqbidN83z1lyNXm3Yc</a>: Connection refused. Skipping.</p>