Fail2ban fails to start on Sangoma PABX
Background On a Sangoma PBX that hadn’t been updated in a long while, Fail2ban failed to start. The trick is to start fail2ban and then
fail2ban
Fail2ban stops working because FirewallD is not running
Observing the fail2ban log file shows that IPs are already banned but still appearing in the list. Closer inspection of the log file shows that
On Mac Mail, and Outlook, How do I ensure that the outgoing server is using authentication?
A bad day at the office is if you’re entire email system goes down, apparently due to a firewall issue. This article documents with screenshots
How to find out why Fail2ban blocked a user
Fail2ban doesn’t have logging to show you that a which “user” gets blocked. The reason is Fail2ban is a low level utility that works across
Fail2ban Postfix SASL Troubleshooting
Background On some Virtualmin server you may find that Fail2ban is logging events, but soon realize that due to the amount of “already banned” messages
How to check and remove IPs from fail2ban
Background Fail2ban is a really powerful utility and can help you out of a bind. The problem is the syntax – it’s changed and when
How to protect a WordPress website from being hacked
Background This security article delves into various best practices and other techniques used to protect a WordPress website from being compromised. It tries to cover
Fail2ban postfix-sasl banning not working for a newly install Virtualmin server
Background It’s important to double check your server security at all times. We have found two instances where Fail2ban Postfix SASL banning on default installations
Fail2Ban ssh-ddos Issue with New Install of Virtualmin and Ubuntu 18.04
Background On a newly installed Virtualmin server you might see events complaining about a missing config file for filter.d/sshd-ddos as per below: Jul 13 19:57:35
How to block and and unblock IP addresses using FirewallD
What is FirewallD? FirewallD (Firewall Daemon) is a nice alternative to iptables but still uses iptables behind the scenes. Yet it’s much simpler and easier