Revoking certificates – Let’s Encrypt – Free SSL/TLS Certificates https://letsencrypt.org/docs/revoking/
Correct Way to Delete a Certbot SSL Certificate | by Matt Hagemann | Medium https://medium.com/@mhagemann/correct-way-to-delete-a-certbot-ssl-certificate-e8ee123e6e01
Apache SSLCertificateFile error: Does not exist or is empty – Server – Let’s Encrypt Community Support https://community.letsencrypt.org/t/apache-sslcertificatefile-error-does-not-exist-or-is-empty/14995/11
How to Validate a Let’s Encrypt Certificate on a Site Already Active on CloudFlare– Cloudflare Support https://support.cloudflare.com/hc/en-us/articles/214820528-How-to-Validate-a-Let-s-Encrypt-Certificate-on-a-Site-Already-Active-on-CloudFlare
Revoke certificate at Centos server – Server – Let’s Encrypt Community Support https://community.letsencrypt.org/t/revoke-certificate-at-centos-server/15785
Correct way to completely remove issued certificate(s) for a domain – Help – Let’s Encrypt Community Support https://community.letsencrypt.org/t/correct-way-to-completely-remove-issued-certificate-s-for-a-domain/7409
Remove a single Certbot (LetsEncrypt) certificate from a server | Jeff Geerling http://www.jeffgeerling.com/blog/2016/remove-single-certbot-letsencrypt-certificate-server
How To Secure Apache with Let’s Encrypt on Ubuntu 14.04 | DigitalOcean https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-ubuntu-14-04
How to Set Up Let’s Encrypt for Multiple Apache Virtual Hosts | DigitalOcean https://www.digitalocean.com/community/tutorials/how-to-set-up-let-s-encrypt-certificates-for-multiple-apache-virtual-hosts-on-ubuntu-14-04
[Solved] Why isn’t my certificate trusted? – Server – Let’s Encrypt Community Support https://community.letsencrypt.org/t/solved-why-isnt-my-certificate-trusted/2479
apache – Do I have to duplicate the Virtualhost directives for port 80 and 443? – Stack Overflow http://stackoverflow.com/questions/679383/do-i-have-to-duplicate-the-virtualhost-directives-for-port-80-and-443
security – How to redirect all HTTP requests to HTTPS – Stack Overflow http://stackoverflow.com/questions/4083221/how-to-redirect-all-http-requests-to-https/21798882#21798882
Check Certificate Revocation Lists the OCSP status of an (SSL) Certificate https://certificate.revocationcheck.com/
Cloudflare– What do the SSL options mean? https://support.cloudflare.com/hc/en-us/articles/200170416-What-do-the-SSL-options-mean-
How to get a Let’s Encrypt certificate while using CloudFlare https://community.letsencrypt.org/t/how-to-get-a-lets-encrypt-certificate-while-using-cloudflare/6338?source_topic_id=7365
How To Set Up Apache with a Free Signed SSL Certificate on a VPS | DigitalOcean https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-with-a-free-signed-ssl-certificate-on-a-vps
The TCP/IP Guide – TCP/IP Internet Message Access Protocol (IMAP/IMAP4) http://www.tcpipguide.com/free/t_TCPIPInternetMessageAccessProtocolIMAPIMAP4.htm
Access IMAP server from the command line using OpenSSL | Dev @ Work http://delog.wordpress.com/2011/05/10/access-imap-server-from-the-command-line-using-openssl/