How to fix VPNFace Lite connection error?

Question

openvpn

Cloud VPS, Ubuntu 16.04 - 64-bit Minimal, clean (tried clean on Debian), ports 1194 and 8808 allowed.
Installation by vpnface-lite.readthedocs.io was successful, the web service interface started on port 8808 without problems, but when the client tries to connect, OpenVPN GUI on Windows 10 x64 gives an error:
...
Sun Jun 03 15:03:24 2018 UDP link local: (not bound)
Sun Jun 03 15:03:24 2018 UDP link remote: [AF_INET]xxxx:1194
Sun Jun 03 15:03:24 2018 MANAGEMENT: >STATE:1528013004,WAIT,,,,,,
Sun Jun 03 15:04:24 2018 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
Sun Jun 03 15:04:24 2018 TLS Error: TLS handshake failed...
...
Client config : [email protected]
...
client
dev tun
proto udp
remote server_ip-address 1194
nobind
user nobody
group nogroup
persist-key
persist-tun
remote-cert-tls server
key-direction 1
cipher AES-256-CBC
auth SHA256
verb 3
... further standard keys ...
Server config: adm.conf
...
#
port 1194
proto udp
dev tun0
ca adm/ca.crt
cert adm/adm.crt
key adm/adm.key
dh adm/dh2048. pem
server 10.1.0.0 255.255.255.0
ifconfig-pool-persist /var/log/openvpn/ipp-adm.txt
client-to-client
keepalive 10 120
tls-auth adm/ta.key 0
key-direction 0
cipher AES-256-CBC
auth SHA256
crl-verify adm /crl.pem
management 127.0.0.1 2294
max-clients 100
user nobody
group nogroup
persist-key
persist-tun
status /var/log/openvpn/adm-status.log
log-append /var/log/openvpn/adm.log
verb 3
explicit-exit-notify 1
...
Tried installing VPNFace Lite on Debian - same result. Moreover, on the same VPS, on the same OS, when installing OpenVPN manually, the client connects without problems. Where to dig, tell me ...

Answer 1

It was a version mismatch between the OpenVPN client and server. Brought it in line and it worked.