I did a fresh install of Windows 2003 server and installed PRTG ver.188.8.131.521. On my firewall, I am seeing lots of UDP port137 traffic from the PRTG server and going to external IPs on the Internet. PRTG is configured to monitor a mirrored port on the switch which is connected to the internal interface of my firewall. It is also configured to monitor certain ports on my switch via SNMP. Why is this?
Is PRTG producing network traffic on UDP port 137?