QRadar: snmpwalk: Failure in sendto (Operation not permitted)

[root@console snmp]# snmpwalk -Os -c public -v 2c 127.0.0.1:8001 iso.3.6.1.2.1.1.1
snmpwalk: Failure in sendto (Operation not permitted)



I solved it by changing port number to 8002 and with additional iptables rules.

# Default iptables rules block 8001 traffic.

[root@console ~]# grep -HR 8001 /etc/* 2>/dev/null |grep REJECT
/etc/sysconfig/iptables:-A INPUT -p tcp --dport 8001 -j REJECT
/etc/sysconfig/iptables:-A INPUT -p udp --dport 8001 -j REJECT
/etc/sysconfig/iptables:-A OUTPUT -p tcp --dport 8001 -j REJECT
/etc/sysconfig/iptables:-A OUTPUT -p udp --dport 8001 -j REJECT

# solution

[root@console ~]# iptables -I INPUT -p udp -m udp --dport 8002 -j ACCEPT
[root@console ~]# iptables -I OUTPUT -p udp -m udp --sport 8001 -j ACCEPT

[root@console ~]# iptables-save