In the environment IPv6 traffic is not used yet and should not be allowed.
You must create a rule to block all IPv6 traffic but allow IPv4 traffic.
Using a similar format as you would use for IPv4 causes both IPv6 and IPv4 traffic to be blocked.
Any IPv6 network rule that starts with 0 is translated to IPv4 as well.
You must specify the IPv6 traffic to block by site.
For example: fe80::/1 will block all traffic from the site which IPv6 addresses begin with fe80.