Allow SNMP ports in FirewallD CentOS
firewall-cmd –zone=public –add-port=161/udp –permanentfirewall-cmd –zone=public –add-port=161/tcp –permanentfirewall-cmd –zone=public –add-port=162/udp –permanentfirewall-cmd –zone=public –add-port=162/tcp –permanentfirewall-cmd –reload or add XML nano ADD file <?xml version=“1.0″ encoding=“utf-8″?><service> <short>SNMP</short> <description>SNMP protocol</description> <port protocol=“udp“ port=“161″/> <port protocol=“tcp“ port=“161″/></service> firewall-cmd –zone=public –add-service snmp –permanent firewall-cmd –reload