AVG Free 9.0 is only antivirus and anti-spyware. The firewall is only part of AVG Internet Security suite. So your firewall can't be AVG. So any of the 2 things you mention can't be relevant for the problem. Now find your firewall.
I am trying to add a wireless printer to my laptop, and I am having a hard time getting past the firewall. The error is 'Unable to communicate with your printer at this time. This may be caused by a Firewall. If you are using firewall software, verify UDP port 427 is unblocked from your printer at XXX.XXX.X.XXX to your PC.'
I havve tried the following things:
1. Under Webshield, Web Protection, and entered the IP address in the Exclude area.
2. Under Resident Shield, Exception, I added the UDP, and the IP address.
3. There was something else that I did at first and it has left my mind now.
I am using the Free version, if I need to upgrade the $34 amount, I am able to do that, but I am hopeful this can be resolved without going Pro. I prepaid 2 years of Norton, and have removed them from both of my computers knowing they were slowing everything down.