IPv6 Firewall is blocking corporate VPN connection attempts whilst disabled

[oldfield1998]

I recently got a new router from sky with the "Sky wifi max" package. However, since switching over, I haven't been able to connect to my corporate VPN. I have narrowed it down to a router/broadband issue as I am able to connect via 4G on my phone.

Having looked at the firewall logs on the router, it looks as though the connection attempt is being dropped/blocked by the IPv6 firewall. The interesting point to note is I have disabled both the IPv6 firewall and IPv6 itself (See Screenshots).

-  https://imgur.com/xeunaPQ

- https://imgur.com/C8YANTg

Having looked at the corporate firewall, there are no logs coming from my IP, indicating that the connection attempt is being blocked by the router firewall before it even hits the corporate firewall. Any ideas on this would be appreciated as I've been stumped for a few days now....

[cookiemonsteruk]

@oldfield1998 

It could be MAP-T implementation. 

I

[TimmyBGood]

@oldfield1998 

As @cookiemonsteruk indicates, that's almost certainly due to the Sky rollout of 8:1 Map-T IPv4 addressing to Max Hubs, which you'll find repeatedly referred to recently in this forum.

https://www.ispreview.co.uk/index.php/2024/06/isp-sky-broadband-uk-deploying-ip-address-sharing-via-... 

The fix is for Sky to revert that particular circuit to a 1:1 mapping, so I'll escalate your post.

[cookiemonsteruk]

@oldfield1998 

Looks like both @TimmyBGood  and myself have escalated this

I've escalated your post via the community chat. This link explains how it works

https://helpforum.sky.com/t5/Did-you-know/Escalating-a-post-to-a-Sky-expert/ba-p/3711147#M1014

Keep an eye out for an invite or blue chat bubble. When the blue bubble does appear you have 48 hours to respond or it will be automatically closed.

[garytryh]

I am having same problem, started yesterday.

My work laptop will not connect to VPN. The only way it is now working is via an EXT plug we brought when we had issue with Apple HomePod not connecting due to firmware. I wonder if this is another Firmware update problem? 

Our router is the white box version. 

Any help?

[Lisa-P1987]

Thanks for escalating this. We’ve sent oldfield1998  an invite to chat.

[oldfield1998]

Hi Lisa, tried to reply to your message but it errors and states that you do not have PM enabled. Any idea on this?

[Lisa-P1987]

You need to engage with the colorful chat icon on the community forum page, not with the message in PM. 

[oldfield1998]

Hi @Lisa-P1987 

Do you happen to have any update on this ticket at all? We did have a chat window open and you escollated the issue to your engineers. However, the chat window has been closed with no resolution.

Any help would be appreciated!

[TimmyBGood]

@oldfield1998 

Current advice is to use the Max Hub administration settings in the My Sky app to switch on UPnP: while this doesn't directly affect VPNs, it should cause the external circuit to move from 8:1 to 1:1 Map-T.

[oldfield1998]

Hi Timmy,

Thanks for reaching out. I have already tried this as it was one of the suggested steps by the support team. Still no luck unfortunately....