Server Maintenance | Updated 2026
The CSF error *WARNING* Binary location for [HOST] [/usr/bin/host] in /etc/csf/csf.conf is either incorrect, is not installed or is not executable means the host command is missing from the system. CSF uses it for DNS lookups in various rules and alerts.
Quick Fix
yum install bind-utils -y
csf -ra01. Cause
The host command is provided by the bind-utils package. It goes missing when:
bind-utilswas never installed (minimal OS installs)- A yum update removed it as an orphaned dependency
- The binary was accidentally deleted
02. Fix
- Install bind-utils:
yum install bind-utils -y - Verify the binary exists:
which host # Should return: /usr/bin/host - Restart CSF and LFD:
csf -ra - Verify no more warnings:
csf -c 2>&1 | grep -i "host"
Other Missing Binaries
CSF checks several system binaries at startup. If you see similar warnings for other tools (dig, nslookup, ifconfig, ip), install their packages:
yum install bind-utils net-tools iproute -yNeed Firewall Help?
If CSF warnings persist or you need help configuring your firewall, contact our team.
Open a Support TicketQuick Recap
- Install:
yum install bind-utils -y - Verify:
which host - Restart:
csf -ra - Check:
csf -cfor remaining warnings - Also install: net-tools, iproute if other binaries are missing
5,638 users found this article useful · Last updated March 2026 · Browse all Server Maintenance articles
