Cannot connect to both firewalls over VPN

[grahambmtw]

I have two pfsense machines which use pfsync/carp for failover.

I have OpenVPN setup on the master which replicated it's settings to the backup.

When the master is online and I connect the VPN I can access the web interface for the master but not the backup and vice versa when I unplug the master for a failover test

Basically when I connect via the VPN, I cannot access the pfsense machine which is not serving the VPN requests.

I need to be able to access both pfsense machines via the VPN

Any thoughts?

EDIT:
I found today that the second firewall is unable to ping anything on the internet when it is the backup. If I make it the master (unplug the primary firewall) then it has access, could this be part of the problem?

Does anyone have any thoughts on this, or do you need more information?

Many thanks,

Graham