Firefox IPv6 out blocked by CIS what are these connections? AV scans were clean

Comodo Internet Security - CIS Firewall Help - CIS
#1

In the past 2 days my 4.01 Firefox started many IPv6 out connection to 192.88.99.1 which I know is an internal IP.

So it seems my firefox is trying to reach the ISP for some reason and all these connections are blocked by the firewall. Firefox is set as web browser in the firewall network setting.

AV scan showed my PC is clean.

Does anyone have anyidea what these IPv6 connections could be?

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#2

Firefox just makes use of the underlying operating system functionality, in the case ipv6. To be specific a 6to4 ipv6 tunnel. 192.88.99.1 is an anycast 6to4 relay server.

If you want to disable ipv6 tunnelling, open a command prompt and copy and paste the following:

netsh interface ipv6 set privacy state=disable
netsh interface ipv6 6to4 set state state=disabled
netsh interface ipv6 isatap set state state=disabled
netsh interface ipv6 set teredo disabled

You can also reread this

#3

Thanks. Not sure I get you because I can’ty see what app would use IPV6 and those connections must be triggered by something. Not aware the OS itself would use it as I have never seen my 7 uses it.

But I did what you recommend. Thank you. Really appreciated :-TU

#4

You only have to visit a site that has an ipv6 address as well as an ipv4 address for a connection to be attempted. usually, ipv4 will be preferred. As I said, ipv6 is enabled in the OS and can be used by any application or process as it wishes, in just the same way that ipv4 is enabled in the OS and can be used by any application or process…

#5

Thanks mate :slight_smile: