AVG blocking file and printer sharing

Hello Lou. 
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We will surely help you with it.
Please try the below steps and check on the issue.
1.Open AVG Internet Security and click the Web & Email tile on the main application screen.
2.Click Settings (the gear icon) in the top-right corner of the screen.
3.Click Basic protection ▸ Enhanced Firewall in the left panel.
4.Please check the box Allow Internet Connection sharing mode.
If issue still persists please let us know.
Thank you.

I have been able to access file on my other computer for years, but now all of a sudden it's being blocked. The message is "Incoming connection blocked". It then state that a connection using file and printer sharing was blocked. Any ideas how to unblock this?

Hello Lou. 
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We will surely help you with it.
Please try the below steps and check on the issue.
1.Open AVG Internet Security and click the Web & Email tile on the main application screen.
2.Click Settings (the gear icon) in the top-right corner of the screen.
3.Click Basic protection ▸ Enhanced Firewall in the left panel.
4.Please check the box Allow Internet Connection sharing mode.
If issue still persists please let us know.
Thank you.