Hi Chris1034,
It's unusual to see this kind of issue with a network device when using Avast Free (this kind of issue is usually connected to the Firewall component in paid version of Avast). The most likely source of the issue is that one of the Core Shields is interfering with the connection. Unfortunately, it isn't possible to add an exception for everything on your subnet due to the way the shields function.
Can I ask if you had to install any utility application from Epson in order to be able to connect to the Wireless printer? If so, can you try to exclude the application from Avast by clicking "Menu" in the top right of the screen > "Settings" > make sure "General" is selected in the leftmost column > Select "Exceptions" in the central column > click "Add Exception" and use the "Browse" button to find and add the Epson application.
If you do not have any such application installed, or adding the exception didn't work, can I ask you to try disabling the Core Shields one-by-one to help identify which one is blocking the connection? To do this, please click on "Protection" on the left-hand side of the Avast window > click the "Core Shields" tile > click the green "ON" toggle underneath the Shield > select a time-frame to stop the Shield for > click "Yes" on the component stop pop-up.
Please let me know which Shield (or combination of shields) you needed to turn off to allow the connection if adding the exception failed to work.
