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Windows Firewall - Block all incoming connections - Breaks IPv6 - Last Modified 2017-06-14 03:24 UTC - Created 2017-06-14 03:24 UTC

https://superuser.com/questions/1217840/windows-10-firewall-block-all-incoming-connections-breaks-ipv6

Customize settings for Windows Firewall with Block all incoming connections, including those in the list of allowed apps

Transmit from the Windows system some IPv6 packets

ping -t -6 www.google.com *(or your router even)*
Notice that the packets get dropped.

Now, disable the Windows Firewall and you get responses.

A bug in Microsoft Windows 7 & 10 code it would appear. It fails to handle packets (tested both DNS and ICMP) originating from the Windows system going out.

Using IPv4 everything works fine.