Useful howtos

NGINX

Configs

NGINX underscores in headers

Cli commands

Clean Linux DNS cache
Clean MAC DNS cache
Clean Windows DNS cache
Self-Signed CA

LINUX

Enable Linux in Windows OS

Linux subsystem in Windows OS

Ansible

Downgrading Ansible Engine on CentOS 7

Mail Subsystem

Spamassasin Manual Learning

sudo

Sudo nopasswd

Perl Warnings

Perl Warnings

Networking

cisco

SYS-4-CONFIG_RESOLVE_FAILURE