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ConfigServer Firewall (CSF)

Server FirewallUnverified

ConfigServer Firewall (CSF) is the open-source baseline for Linux server security. It is a configuration and management layer on top of iptables and nftables, plus a daemon (LFD, the Login Failure Daemon) that watches log files in real time and auto-bans IPs that brute-force SSH, FTP, IMAP, POP3, or the control panel.

configserver.com ↗2006 (UK)
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Category
Server Firewall
Best for
Sysadmins, VPS owners
Pricing
Free (open source)
Founded
2006 (UK)

HOW IT WORKS

CSF has been the de-facto firewall on shared hosting servers for nearly two decades. It is free, scriptable, and extensively documented. Hosts who run more sophisticated suites (BitNinja, Imunify360) still typically run CSF underneath, because the two layers do not overlap: CSF handles the network firewall and brute-force banning, the suite handles application-layer threats.

CSF is a sysadmin tool, not a turnkey product. It rewards a host that already runs Linux confidently and wants the lowest-friction firewall on top of the OS, not one that wants a vendor to take responsibility.

Category context: Network-layer firewall on the host. The baseline every server should have; everything else stacks on top.

WHAT IT DOES

  • IPv4 / IPv6 firewall (iptables and nftables front-end)
  • Login Failure Daemon (LFD) for brute-force auto-banning
  • Country-level allow and deny lists
  • cPanel, DirectAdmin, Webmin UI plugins
  • Distributed-attack detection across the install

BEST FOR

  • Self-managed VPS owners running Linux
  • Hosts who already run a full security suite and want a free network-firewall layer beneath it
  • Sysadmins who prefer scriptable, well-understood tools over GUI products

ALTERNATIVES TO CONFIGSERVER FIREWALL (CSF)

Server WAF
BitNinja

Server-side security suite built for hosting providers.

Compare →
Server WAF
Imunify360

Comprehensive server security suite widely deployed by shared hosts.

Compare →
Server Malware
Monarx

Behavioural server-side malware detection that catches what signature scanners miss.

Compare →

CONFIGSERVER FIREWALL (CSF) FAQ

What is ConfigServer Firewall (CSF)?

CSF is a free, open-source server firewall for Linux. It is a configuration and management layer on top of iptables and nftables, plus a Login Failure Daemon (LFD) that watches log files and auto-bans IPs that brute-force common services. It is the de-facto baseline firewall on shared hosting servers and is widely deployed across the Linux hosting ecosystem.

Is CSF free?

Yes. CSF is open source and free to use, with no paid tier. The ConfigServer organisation does sell complementary commercial products (ConfigServer eXploit Scanner, ConfigServer Mail Manage and Monitor), but CSF itself is and always has been free.

Do I need CSF if I run BitNinja or Imunify360?

CSF and the server-level security suites do not overlap. CSF handles the network firewall and login-failure banning at the OS level; the suites handle application-layer WAF, malware scanning, and reputation lookups. Most hosts running BitNinja or Imunify360 still run CSF underneath as the network-firewall layer, because it costs nothing and the layers complement each other.

Editorial independence

HostList is independent. This profile is editorial; HostList accepts no sponsorship, affiliate commission, or paid placement from ConfigServer Firewall (CSF) or any security vendor.