Port 2055 · NetFlow

Port 2055 is NetFlow, UDP.

Cisco NetFlow — flow export from routers and switches to a flow collector for traffic analysis.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service udp-2055 protocol udp port 2055

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application netflow service udp-2055 action allow

Risk and exposure

Rated low risk. Even so, only expose this port to the networks and hosts that need it, and keep it patched.

Check it

• Linux ss -ulnp | grep :2055
• nmap nmap -sU -p 2055 <host>

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