UDP Port 161

Applications Infrastructure Monitoring
1

hi guys

My linux server have SNMP configure port by default is 161 (UDP)
now my monitor team - who are using Nagios - say the server are not being monitor

so check netstat -lnu and I see all is OK and snmp service is running fine
what else should I check about this port 161? to see if it is really opened and listening?

I forgot to add the netstat -lun output

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State

udp        0      0 0.0.0.0:161                 0.0.0.0:*

thanks a lot