Check SSL Certificate Fingerprint from Command Line | It is possible to check a fingerprint of an SSL cert from the command line with openssl. In light of recent SHA1 deprecation in the news, this tip should be handy!
Important: Use checkrestart on Debian after installing security updates | The app checkrestart should be run after installing security updates on Debian. Incorporate this into your maintenance and security tasks right away!
Disable SSH OS Banner on FreeBSD | By default, FreeBSD includes an SSH banner that identifies the exact OS. For best security, you may wish to disable broadcasting this information to the world. Here’s the tip!