I keep getting an alert that the firewall has blocked local network access to my PC. UDP port XXXX (keeps changing) ever few seconds from 18.104.22.168 (DNS) That IP address is from Comcast, my ISP. Should I permit this activity or keep blocking? Smart Advisor tells me the following: ZoneAlarm has blocked access to port 1374 on your computer ZoneAlarm has successfully stopped local network or Internet traffic from reaching your computer. No breach in your security has occurred. Your computer is safe. What happened? ZoneAlarm blocked traffic to port 1374 on your machine from port 53 on a remote computer whose IP address is 22.214.171.124. This communication attempt may have been a port scan, or simply one of the millions of unsolicited commercial or network control messages that are routinely sent out over the Internet. Such unsolicited messages are often called Internet background noise. Should I be concerned? This alert should not be a cause for concern. ZoneAlarm has protected your machine according to the firewall settings you have selected.