When the new version of Norton 360 installed I lost communication with my wireless HP Officejet 6600 All-in-one printer. Previously, communication had been fine except for an annoying inability of the the PC to find the printer status as on-line, usually resolved by restarting the printer and router. After quite a bit of online searching, I realized that the bi-directional communication with the printer was being blocked by the Norton Firewall. I learned that HP products typically communicate for printing over UDP port 427 and TCP port 9100 and 9101, and for Scanning and Faxing over UDP port 427 and TCP port 9220. I added three new Traffic Rules to the firewall configuration:
Printing, Scanning and Faxing UDP port 427
Printing TCP port 9100
Scanning and Faxing TCP port 9220
For security purposes, I assigned a static IP to my printer and allow bi-directional communication between my networked PC's and this static IP only.
This seems to have worked. In fact, the annoying "printer offline" message is mostly a thing of the past.