Terkadang pada saat proses renewal Certs Letsencrypt sebuah domain muncul pesan error seperti dibawah :

<code>Cert not yet due for renewal
All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/example.org/fullchain.pem (failure)</code>

kemudian menyusul pesan error berikut :

<code>Domain: example.org
   Type:   unauthorized
   Detail: Invalid response from
   https://example.org/.well-known/acme-challenge/Vr1t8IAE2lemQGW_KfkJO2P28xZMgLBkg8h93XkghpQ
   [12.34.56.78]: "<html>\r\n<head><title>403
   Forbidden</title></head>\r\n<body
   bgcolor=\"white\">\r\n<center><h1>403
   Forbidden</h1></center>\r\n<hr><center>"

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address.</code>

Mungkin secara logika dapat saja dibuatkan folder pada root domain sesuai dengan yang tertera diatas, tapi setelah aku coba ternyata tidak berhasil.

Untuk menyelesaikan itu cukup dengan menjalankan perintah (khusus yang menggunakan Nginx) berikut :

<code>./letsencrypt-auto --nginx -d example.org</code>

Apabila pesan yang muncul seperti dibawah, berarti proses telah berhasil dan Certs telah diperpanjang.

<code>Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Cert is due for renewal, auto-renewing...
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for example.org
Waiting for verification...
Cleaning up challenges
Deploying Certificate to VirtualHost /etc/nginx/sites-enabled/example.org

Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.
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1: No redirect - Make no further changes to the webserver configuration.
2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for
new sites, or if you're confident your site works on HTTPS. You can undo this
change by editing your web server's configuration.
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2
Traffic on port 80 already redirecting to ssl in /etc/nginx/sites-enabled/example.org

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Your existing certificate has been successfully renewed, and the new certificate
has been installed.

The new certificate covers the following domains: https://example.org

You should test your configuration at:
https://www.ssllabs.com/ssltest/analyze.html?d=example.org
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IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/example.org/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/example.org/privkey.pem
   Your cert will expire on 2020-02-07. To obtain a new or tweaked
   version of this certificate in the future, simply run
   letsencrypt-auto again with the "certonly" option. To
   non-interactively renew *all* of your certificates, run
   "letsencrypt-auto renew"
</code>

Cara diatas sudah aku coba pada Debian yang menggunakan web engine Nginx … metode diatas sukses.

Selamat mencoba ….

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