VPN works, but can only access hosts through IP. Hostname does not resolve

[KenGeo]

I've have Open VPN setup on 2.3.4.  I have an AD DNS server set as primary under General setup and OPENvpn

On Client
Opens up fine, I can ping any IP, but I cannot ping hostnames.

IPconfig /all shows the correct DNS server

Lan 192.168.1.168/24
VPN Tunnel 10.0.0.0/24

OpenVPN
Protocol UDP
port 1194
Redirect Gateway on
DNS points to AD DNS Server 192.168.1.4

Firewall
WAN any to any port 1194
OPENVPN any to any

any ideas?

[KenGeo]

What worked:

It was the DNS suffix:
On a computer on a domain, I needed to ipconfig /all, and under "Connection-specific DNS Suffix" it showed local.domainname.com

Thats what needs to be under "DNS Default Domain" under VPN -> OpenVPN -> Servers -> edit