LDAP Server Setup - Authentication containers "SELECT" returns no results

[sc0ttjm]

Hi,

I'm trying to setup an LDAP server in OPNsense to use for VPN Authentication.
When I click on "Select" in the "Authentication containers" section, there are no results returned in the selection window that eventually is returned.

To prove the settings and credentials I'm using are correct, I installed AD Explorer on a local machine and a remote machine connected by an IPsec tunnel on the OPNsense router and I could access AD using LDAP fine.

I have an Windows 2008R2 AD Server locally, behind a DrayTek 3900 firewall/router, connected through an IPsec VPN Tunnel to the Datacentre with a VM running OPNsense and a test server on the LAN side of the OPNsense server.

The test server can access AD using LDAP through the IPSec tunnel between the DrayTek and the OPNsense router.
The OPNsense router itself doesn't seem to be able to access AD using LDAP.

Please can anybody help me work out what's going wrong?

[sc0ttjm]

Just a quick update.
I've conducted some more investigations today to try and figure out what's going on.
The problem is that even though a VPN IPsec tunnel is established and I can connect THROUGH the VPN, the OPNsense router itself does not use the IPsec tunnel so cannot contact the remote server by IP.
If I run a "tracert" from the server it tries to contact the server over the WAN connection not over the IPsec tunnel.
If I try and ping the server it again tries to contact it over WAN.
How do I get the OPNsense server to follow it's own routes?