Category Archives: Linux

Ubuntu Certbot Update

Posted by ITomation

With the upcoming deprecation of TLS-SNI-01, Let’s Encrypt certificate renewals may start breaking for some clients. For more information regarding the TLS-SNI-01 ACME protocol deprecation see Bulletproof TLS Newsletter #37.   As per Let’s Encrypt’s recent notification, “It will stop working temporarily on February 13th, 2019, and permanently on March 13th, 2019”. TLS-SNI-01 validation is […]

Disable IPv6 in Ubuntu

Posted by ITomation

IPv6 may not always be required and some administrators may elect to disable it on their servers. Here is how to disable IPv6 in Ubuntu Linux. To learn more about IPv6 please visit Wikipedia.   1. Open the “/etc/sysctl.conf” file for editing. To open the file for editing using nano type the following:   sudo nano /etc/sysctl.conf […]

Easily Change GRUB Boot Order in Kali Linux

Posted by ITomation

When Windows is installed on top of Kali Linux, the Linux GRUB has Kali configured as the default boot operating system. This can get quite bothersome for those of us who boot into Windows more than 50% of the time and consider Windows their “main” operating system in a dual boot configuration. After all, no one […]