Hopefully, this helps someone who is still looking for an answer as all the replies above do not come to a solution and a google search for remedies does the same.
If you are using Avast Business Security, you need to make sure your private network is considered “friendly” by Avast’s firewall.
Open up Avast
Settings
Click “Components” (located on left-hand menu)
Click “Customize” next to “Firewall” Component
Click “Network Profiles” (located on left-hand menu)
Check mark the Friends radial box next to your network name
Click OK
Finished
Hope that helps!
