After updated to OpenVPN Connect, it cannot connect to my own VPN Server

I have used OpenVPN Connect (iOS) for several months already.

Recently, I have updated the OpenVPN via APP Store to OpenVPN 1.2.5.

However, it is unable to connect with my VPN server. It is always stuck at the "Waiting for server" and then it appears "Connection timeout".

The same OpenVPN config is well-run on my another iOS device (with OpenVPN 1.1.1).

May I know how to solve the issue?

The following is my VPN config: (For some reasons I have blind the CERTIFICATE & IP Address)

**client

dev tun

proto udp

remote x.x.x.x 13000

float

cipher AES-256-CBC

comp-lzo no

keepalive 15 60

auth-user-pass

ns-cert-type server

<ca>

-----BEGIN CERTIFICATE-----

xxxxxx

-----END CERTIFICATE-----

</ca>

<tls-auth>

-----BEGIN OpenVPN Static key V1-----

xxxxxx

-----END OpenVPN Static key V1-----

</tls-auth>

resolv-retry infinite

nobind**

And it is the log when I tried to connect my VPN network:

**2018-01-14 01:33:29 ----- OpenVPN Start -----

OpenVPN core 3.1.2 ios arm64 64-bit built on Jan  5 2018 23:09:59

2018-01-14 01:33:29 Frame=512/2048/512 mssfix-ctrl=1250

2018-01-14 01:33:29 UNUSED OPTIONS

12 [resolv-retry] [infinite]

13 [nobind]

2018-01-14 01:33:29 EVENT: RESOLVE

2018-01-14 01:33:29 Contacting [x.x.x.x]:13000/UDP via UDP

2018-01-14 01:33:29 EVENT: WAIT

2018-01-14 01:33:29 Connecting to [x.x.x.x]:13000 (x.x.x.x) via UDPv4

2018-01-14 01:33:39 EVENT: DISCONNECTED**