Network Security

Network security guides covering firewall rules, UFW, Fortinet, port management, access restrictions and reducing the attack surface. Apply security rules in a controlled order so you do not cut off your own remote access.

The firewall decides which ports and which addresses can reach your server. Set up correctly, only the web, mail and management ports stay open and everything else is invisible from outside. Set up wrongly, it cuts your own SSH connection, which is why every rule should be tested from a second session.

For Ubuntu and Debian servers, UFW firewall setup starts from the smallest rule set. For hardware that protects several servers and an office network, see network security with Fortinet FortiGate. The SSH side is covered in secure SSH access, and the complete checklist for a VDS in the VDS security guide.

Fiberserver VDS and dedicated servers come with network-level DDoS protection; the firewall inside the server complements that protection, it does not replace it.