I'm using the OpenVPN Connect client on Android and using the QNAP created VPN file with a few small changes:
1 2 3 4 5 6 7 8 9 10 11 12 13 | # added so the OpenVPN Connect client doesn't# complain about missing client certclient-cert-not-required# I uncheck the Use remote network as default gateway # option so need to manually add route/sroute 10.19.88.0 255.255.255.0# instead of having a separate ca.crt# embed it inline in the openvpn.ovpn file<ca>... the contents of ca.crt here</ca> |
On Windows 10 the above works fine. But I just couldn't get Android to connect. The only error was "Session invalidated: KEEPALIVE_TIMEOUT"
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 18:59:52.389 -- Tunnel Options:V4,dev-type tun,link-mtu 1558,tun-mtu 1500,proto UDPv4,comp-lzo,cipher AES-128-CBC,auth SHA1,keysize 128,key-method 2,tls-client18:59:52.391 -- Creds: Username/Password18:59:52.400 -- Peer Info:IV_GUI_VER=OC30AndroidIV_VER=3.git::f225fcd0:ReleaseIV_PLAT=androidIV_NCP=2IV_TCPNL=1IV_PROTO=2IV_LZO=1IV_IPv6=019:00:32.383 -- Session invalidated: KEEPALIVE_TIMEOUT |
The fix was to open the OpenVPN Connect Android client and check an option in Settings
In hind sight the log output gave a hint as to the problem when it mentions "cipher AES-128-CBC" so enabling AES-CBC Cipher Algorithm fixed the problem and I could connect with Androids OpenVPN Connect client
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