https://uid1k.blog/tags/firewalld/ Recent content in Firewalld on UID1k Blog Hugo en Sat, 22 Aug 2026 17:30:25 +0300 https://uid1k.blog/posts/firewalld-ipset-postfix/ Sat, 22 Aug 2026 17:30:25 +0300 https://uid1k.blog/posts/firewalld-ipset-postfix/ <p>Today we gonna explore a interesting security issue and solution for it. While most organization are using centralized logging and centralized firewalls, services running on standalone servers or VMs have been always a target to malicious actors. In today post we will dive into authentication failures and ways to protect ourselves from those. In our scenario we will be protecting a mail server, which is running postfix and dovecot locally. However the method described here is not limited to the services mentioned above and can be applied to a large number of others.</p>