Port 161UDP
Monitoring and polling devices.
What is harbour 161 for?
The protocol or service generally associated with the SNMP.
Transport Protocol
UDP
Safety precautions
Avoid SNMPv1/v2c with default communities.
Should we open this port in the firewall?
Only if a service is actually needed the use it. Apply the principle of any privilege: limit the authorized sources, destinations and interfaces, and then log connections when relevant.
How do I check this port?
Test-NetConnection SERVER -Port 161Under Linux, you can use nc -vz SERVER 161.
Port/service associations are common conventions. An application can be configured on another port.