VPS Guide: Your Go-To for VPS, Ubuntu & Command Line Success

Block Ports with firewalld on AlmaLinux VPS

Category: Security

Use firewalld—a firewall—on an AlmaLinux VPS—block port 23:

firewall-cmd --remove-port=23/tcp --permanent

reload:

firewall-cmd --reload

On Hetzner test with

nc -zv ip 23

—expect failure Secures hosting—limits exposure