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Add or remove domain to existing Letsencrypt's cert

For installation via certbot

Snippet Nginx Config SSL Letsencrypt

Posted by Calvin Chieng on June 27, 2019, 16:03

How to set CAA DNS record?

To hint SSL CA if they are authorized to issue a cert for this domain

Guide Security SSL DNS

Posted by Calvin Chieng on March 21, 2018, 17:48

Letsencrypt "Invalid response" error during renewal due to http/https redirection

Make sure the authorization file can be accessed

Error Nginx SSL Letsencrypt

Posted by Calvin Chieng on February 2, 2018, 11:45

Implement and Verify Certificate Pinning in Android

With Android Nougat Security Config and Retrofit

Guide Android Security Retrofit SSL

Posted by Calvin Chieng on July 28, 2017, 20:27

TLS SSL protocols and cipher suites

Provide the correct cipher suites with the correct protocols for smooth and secure HTTPS experience.

Article SSL Security TLS

Posted by Calvin Chieng on September 17, 2016, 16:41

Enabling HSTS in Nginx

HSTS tells the client to use https only on a specific domain

Article SSL Nginx HSTS

Posted by Calvin Chieng on August 18, 2016, 15:41

Using Let's Encrypt as your SSL Cert Authority via Certbot

Certbot is a letsencrypt.org client that works on most linux OS

Guide SSL Nginx Letsencrypt

Posted by Calvin Chieng on August 18, 2016, 13:49

Using custom DH Param in Nginx

Avoid using nginx default dh param

Guide Security SSL Nginx DH Param

Posted by Calvin Chieng on August 18, 2016, 12:21