The "Network threat blocked" notification indicates that ESET has detected and blocked an intrusion attempt (it does not indicate that your system is infected)
Verify that program module updates are downloading properly (these will include ESET firewall module updates whenever they are available). Update ESET products—check for latest product modules.
If your ESET product detects an infection, complete preliminary malware troubleshooting.
If your ESET product does not detect an infection, disable intrusion detection notifications.
If your system is not infected, follow the step below to disable Detected Port Scanning Attack notifications:
Press the F5 key to open Advanced setup.
To re-enable these notifications, repeat steps 1-2 above, click the slider bar next to Notify about attack detection to enable it and click OK.