[Apache] How to Fix SSL (HTTPS) Not Starting

On Apache 2.0.x, HTTPS stays down after apachectl restart unless you start with startssl or the -DSSL option.

[Let's Encrypt] Solution When 'Cert not yet due for renewal' Message Occurs with certbot renew

Understanding certbot renew's 'Cert not yet due for renewal' message and when to actually run manual renewal.

[Let's Encrypt] How to Fix certbot renew Error: Could not bind TCP port 443 because it is already in use by another process on this system

Fixing certbot renew's port 443 conflict by using the --nginx plugin option — no Nginx stop, no downtime.

Facebook App SSL Authentication Becomes Mandatory from October 1, 2011

SSL becomes mandatory for Facebook apps and iframe Page tabs from October 1, 2011 — a summary with links.

Issuing SSL Server Certificates for Local Environment with mkcert

Issuing SSL/TLS certificates for localhost with mkcert, from install to multi-domain certs.