T21P E2 OpenVPN TLS Handshake Failed

[ngefvert]

We have T21P E2, firmware version 52.80.0.95. I have not been able to get the VPN successfully working on it, we keep seeing 'TLS Handshake failed' in the OpenVPN server logs.

This is the configuration we are using:

Code:

dev tun
persist-tun
persist-key
cipher BF-CBC
auth MD5
tls-client
client
resolv-retry infinite
remote <valid IP here> 1195 udp
ca /config/openvpn/keys/ca.crt
cert /config/openvpn/keys/client.crt
key /config/openvpn/keys/client.key
ns-cert-type server

The keys are all SHA-1. The same configuration and keys work to allow a Windows client to connect to the VPN successfully, so I am not sure what is happening with the Yealink. We have tried upgrading to a newer firmware (the one we are on now) and using MD5 authentication as noted above.