LDAP query over OpenVPN

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Hello everyone

I have a AD setup behind an OpenVPN connection. The connection ist working and clients can access AD.

What I want to setup is OpenVPN access with AD credentials. I have this in other sites, that have an AD Server on site. But this Firewall is setup in a location without an AD server. So it has to look through a VPN to get the credentials. I've checked the credentials and they check out. So I'm guessing this is the problem
https://doc.pfsense.org/index.php/Why_can%27t_I_query_SNMP,_use_syslog,_NTP,_or_other_services_initiated_by_the_firewall_itself_over_IPsec_VPN

I've tried it, but I still can't ping (from gui) from localhost to the AD Server behind VPN. Is there anything else I can try?

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Nobody any ideas? Can't make it work sadly…