AVG 17.5.x firewall blocking Hyper-V VM connections

The Scenario

I have a Windows 10 (v1607) Pro instance with AVG Internet Security 17.5 installed, including the AVG Firewall component.

I have the Hyper-V feature enabled and an Internal Hyper-V vSwitch named “hv-int” which all my VMs use. This vSwitch uses the APIPA 169.254.0.0/16 range.

AVG175_version.png

The Problem

I cannot locally connect to any of my VMs via the Connect option in Hyper-V Manager, the connection just times out after several attempts. When I disable the AVG Firewall it works fine, but I don’t want to permanently disable my Firewall for obvious reasons.

The Solution

By default all local network connections, including Hyper-V vSwitches are classified as Public. By changing this to the more trusted Private option the local connections are permitted:

Step 1: Open the AVG management console

AVG175-0.png

Step 2:  Click the Internet Security option:

AVG175-1.png

 

Step 3:  Click the top-right Menu > Settings option – this lists the AVG components installed.

AVG175-2.png

Step 4: Click the left-menu Components option and in the main pane scroll down to the Firewall option. Click Customize.

AVG175-3.png

Step 5: Click the left-menu Network profiles option and in the main pane locate your Hyper-V vSwitch. Change the Profile type from Public to Private. Click OK to confirm the changes and exit out of the AVG console.

AVG175-4.png

Now try launching a local connection to the VM via the Hyper-V Manager, in my case it now worked.

 

Disclaimer: provided “AS IS” with no warranties and confer no rights

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