T27G openvpn

[systems]

Hi

We run a few openvpn connections.
I have the following versions:-

Firmware Version 69.83.0.10
Hardware Version 69.0.0.0.0.0.0

I have created SHA1 certs for the phone
My config is shown as follows:-

remote x.x.x.x
port 1255
proto udp
nobind
dev tun
dev-type tun
ifconfig 172.x.x.2 172.x.x.1
ca /config/openvpn/keys/ca.crt
cert /config/openvpn/keys/yealink01.crt
key /config/openvpn/keys/yealink01-1.key
comp-lzo
ns-cert-type server
verb 5
tls-client
client
resolv-retry infinite

Syslog is showing:-


May 31 17:21:20 172.16.0.176 openvpn[1330]: OpenSSL: error:14090086:lib(20):func(144):reason(134)
May 31 17:21:20 172.16.0.176 openvpn[1330]: TLS_ERROR: BIO read tls_read_plaintext error
May 31 17:21:20 172.16.0.176 openvpn[1330]: TLS Error: TLS object -> incoming plaintext read error
May 31 17:21:20 172.16.0.176 openvpn[1330]: TLS Error: TLS handshake failed

Why does it fail ?
Phone is connected to NTP and time looks correct.