VPN set up, can ping and SSH LAN devices, but not view web interfaces

[ensemble]

Hi,

I have an L2TP VPN set up and working.

I can SSH and ping all the internal machines & switches using internal IPs.

I cannot open the PFSense web interface using the gateway IP, nor any other website or web interfaces on the internal switches.

i am able to view all of these sites without a problem from physically within the LAN.  But from outside, over VPN despite being able to ping and SSH,  I cannot access the web interfaces of my equipment.  Can anyone help?

What is missing in my firewall for web interface access over L2TP VPN?

Thanks.

Euan