Confused about SSL/TLS certificates? Here is a quick and dirty introduction to SSL/TLS encryption.
AWS and Microsoft, the two leaders in the race for the best cloud infrastructure, have recognized cyber security as a barrier of adoption. Cyber security professionals are weary of migrating workloads into public cloud environments as it may carry significant risks. Thus, Amazon and Microsoft have developed specialized services to help safeguard users’ cloud infrastructure and data.
This post discusses ways to mitigate cyber threats and launch a cyber defense on AWS and Azure.
In the age of cyber warfare, being paranoid is the only reasonable attitude and that means, among other things, being paranoid about software updates.
In order to figure out how many days your letsencrypt certificates have left, you could check an online services such as:
However, that won’t work for a mail server that’s not also running a web server using the same certificate.
In this case, your best bet is to check the certificate file directly using the openssl command as follows:
openssl x509 -noout -dates -in /etc/letsencrypt/live/smtp.yourmailserverdomainname.com/cert.pem
When using authentication based on keys (as opposed to a password), you have to create the key pair—a private key and a public key—on your local machine, then transfer the public key to the server and install it there. Here is how to do this on a Windows desktop for remote access to a Linux server.