ufw

root@majoit:~# ufw disable
Firewall stopped and disabled on system startup
root@majoit:~# ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
ERROR: problem running ufw-init
libkmod: ERROR ../libkmod/libkmod.c:505 kmod_lookup_alias_from_builtin_file: could not open builtin file '/lib/modules/2.6.32-042stab076.8/modules.builtin.bin'
FATAL: Module nf_conntrack_ftp not found.
libkmod: ERROR ../libkmod/libkmod.c:505 kmod_lookup_alias_from_builtin_file: could not open builtin file '/lib/modules/2.6.32-042stab076.8/modules.builtin.bin'
FATAL: Module nf_nat_ftp not found.
libkmod: ERROR ../libkmod/libkmod.c:505 kmod_lookup_alias_from_builtin_file: could not open builtin file '/lib/modules/2.6.32-042stab076.8/modules.builtin.bin'
FATAL: Module nf_conntrack_netbios_ns not found.
iptables-restore: line 69 failed
iptables-restore: line 30 failed
ip6tables-restore: line 65 failed
ip6tables-restore: line 50 failed
sysctl: permission denied on key 'net.ipv4.tcp_sack'

Problem running '/etc/ufw/before.rules'
Problem running '/etc/ufw/after.rules'
Problem running '/etc/ufw/before6.rules'
Problem running '/lib/ufw/user6.rules'