Donāt know if this is still an issue, but here my suggestion.
Your problem sounds firewall related to me. After playing around choice of two fixes, one simple; one more involved.
Simple fix first. Open Avast; goto Firewall tab / Firewall Settings sub-tab. Change WORK ZONE to HOME ZONE, this should allow others on your network access to your pc.
The other fix involves changing the settings for the WORK ZONE.
Open Avast; goto Firewall tab / Application Rules sub-tab.
From the listed Applications, expand Microsoft Corporation and System;
On the bar chart near āFriends in and Internet Outā, click the fourth bar.
This will change the access description to āAllow outbound access to the Internet and inbound access from Friendsā, and should allow otherās on your network access to your pc.
I donāt use ICS, each of my two systems here has its own connectionā¦ so, in other words, does that mean that if needed ICS doesnāt work properly through AIS firewall, would be nice to get an answer from the devsā¦