Virgin Media Superhub and VPNs

Following a migration to an upgraded speed package on a Virgin fibre connection a hardware VPN stopped working properly. The connection would connect, but only remain up for 40 seconds and during this time very little data would transfer across it properly

On further inspection, even though we had public IPs hitting the equipment behind the superhub, the superhub itself was still interfering with data. 

To resolve this issue, you need to turn off the super-hub firewall (only recommended if you have another firewall behind it like we do) and then also go to the security settings and enable the VPN pass-through options.

Once this was done, the data was free to move correctly and the VPN no longer disconnected.

Usually this sort if thing gets checked, but if I have a public IP assigned to equipment behind the superhub I wouldn't expect it to ever play with the data its passing through.

We live and learn.

-- Update --

The above seem was originally written for a Super Hub 1 but since writing this I've also had to use it to resolve issues with software VPNs and Superhub 2s. The below steps to sort this on a SH2 are:

1. Log into the Superhub (default IP is 192.168.0.1)
2. Enter your username and password (this is generally on the bottom of the router)
3. Go to Advanced Settings (at the bottom of the page).
4. Go to (Security) "Firewall".
5. Uncheck all boxes except "PPTP Pass-Through" – if PPTP Pass through is not checked, please check it.
6. Click Apply