Why is OpenVPN Client Failing to Connect on Linux?

This VPN works fine in Windows however trying to start it in CentOS works for a few seconds and eventually stops with no message in error logs. Also the server instantly stops responding to pings whilst connecting where as the Windows machine keeps going.

clientdev tunproto udpremote 151.80.xxx.xxx 1194resolv-retry infinitenobindpersist-keypersist-tunremote-cert-tls serverauth SHA512cipher AES-256-CBCignore-unknown-option block-outside-dnsblock-outside-dnsverb 3

ip r without VPN active

default via 51.195.234.254 dev eth0 51.195.234.254 dev eth0 scope link

With it active

0.0.0.0/1 via 10.8.0.1 dev tun0 default via 51.195.234.254 dev eth0 10.8.0.0/24 dev tun0 proto kernel scope link src 10.8.0.2 51.195.234.254 dev eth0 scope link 128.0.0.0/1 via 10.8.0.1 dev tun0 151.80.xxx.xx via 51.195.234.254 dev eth0

Log

Fri May 21 19:42:19 2021 OpenVPN 2.4.11 x86_64-redhat-linux-gnu [Fedora EPEL patched] [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Apr 21 2021Fri May 21 19:42:19 2021 library versions: OpenSSL 1.0.2k-fips  26 Jan 2017, LZO 2.06Fri May 21 19:42:19 2021 Outgoing Control Channel Encryption: Cipher 'AES-256-CTR' initialized with 256 bit keyFri May 21 19:42:19 2021 Outgoing Control Channel Encryption: Using 256 bit message hash 'SHA256' for HMAC authenticationFri May 21 19:42:19 2021 Incoming Control Channel Encryption: Cipher 'AES-256-CTR' initialized with 256 bit keyFri May 21 19:42:19 2021 Incoming Control Channel Encryption: Using 256 bit message hash 'SHA256' for HMAC authenticationFri May 21 19:42:19 2021 TCP/UDP: Preserving recently used remote address: [AF_INET]151.80.xxx.xxx:1194Fri May 21 19:42:19 2021 Socket Buffers: R=[212992->212992] S=[212992->212992]Fri May 21 19:42:19 2021 UDP link local: (not bound)Fri May 21 19:42:19 2021 UDP link remote: [AF_INET]151.80.xxx.xxx:1194Fri May 21 19:42:19 2021 TLS: Initial packet from [AF_INET]151.80.xxx.xxx:1194, sid=3b917597 2f279e15Fri May 21 19:42:19 2021 VERIFY OK: depth=1, CN=ChangeMeFri May 21 19:42:19 2021 VERIFY KU OKFri May 21 19:42:19 2021 Validating certificate extended key usageFri May 21 19:42:19 2021 ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server AuthenticationFri May 21 19:42:19 2021 VERIFY EKU OKFri May 21 19:42:19 2021 VERIFY OK: depth=0, CN=serverFri May 21 19:42:19 2021 Control Channel: TLSv1.2, cipher TLSv1/SSLv3 ECDHE-RSA-AES256-GCM-SHA384, 2048 bit RSAFri May 21 19:42:19 2021 [server] Peer Connection Initiated with [AF_INET]151.80.xxx.xxx:1194Fri May 21 19:42:20 2021 SENT CONTROL [server]: 'PUSH_REQUEST' (status=1)Fri May 21 19:42:20 2021 PUSH: Received control message: 'PUSH_REPLY,redirect-gateway def1 bypass-dhcp,dhcp-option DNS 213.186.33.99,dhcp-option DNS 213.186.33.199,route-gateway 10.8.0.1,topology subnet,ping 10,ping-restart 120,ifconfig 10.8.0.2 255.255.255.0,peer-id 0,cipher AES-256-GCM'Fri May 21 19:42:20 2021 OPTIONS IMPORT: timers and/or timeouts modifiedFri May 21 19:42:20 2021 OPTIONS IMPORT: --ifconfig/up options modifiedFri May 21 19:42:20 2021 OPTIONS IMPORT: route options modifiedFri May 21 19:42:20 2021 OPTIONS IMPORT: route-related options modifiedFri May 21 19:42:20 2021 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modifiedFri May 21 19:42:20 2021 OPTIONS IMPORT: peer-id setFri May 21 19:42:20 2021 OPTIONS IMPORT: adjusting link_mtu to 1624Fri May 21 19:42:20 2021 OPTIONS IMPORT: data channel crypto options modifiedFri May 21 19:42:20 2021 Data Channel: using negotiated cipher 'AES-256-GCM'Fri May 21 19:42:20 2021 Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit keyFri May 21 19:42:20 2021 Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit keyFri May 21 19:42:20 2021 ROUTE_GATEWAY 51.195.234.254Fri May 21 19:42:20 2021 TUN/TAP device tun0 openedFri May 21 19:42:20 2021 TUN/TAP TX queue length set to 100Fri May 21 19:42:20 2021 /sbin/ip link set dev tun0 up mtu 1500Fri May 21 19:42:20 2021 /sbin/ip addr add dev tun0 10.8.0.2/24 broadcast 10.8.0.255Fri May 21 19:42:20 2021 /sbin/ip route add 151.80.xxx.xxx/32 via 51.195.234.254Fri May 21 19:42:20 2021 /sbin/ip route add 0.0.0.0/1 via 10.8.0.1Fri May 21 19:42:20 2021 /sbin/ip route add 128.0.0.0/1 via 10.8.0.1Fri May 21 19:42:20 2021 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent thisFri May 21 19:42:20 2021 Initialization Sequence Completed

Windows ipconfig /all

Unknown adapter OpenVPN TAP-Windows6:   Connection-specific DNS Suffix  . :   Description . . . . . . . . . . . : TAP-Windows Adapter V9   Physical Address. . . . . . . . . : 00-FF-18-08-1B-04   DHCP Enabled. . . . . . . . . . . : Yes   Autoconfiguration Enabled . . . . : Yes   Link-local IPv6 Address . . . . . : fe80::5185:de54:7498:6c08%4(Preferred)   IPv4 Address. . . . . . . . . . . : 10.8.0.2(Preferred)   Subnet Mask . . . . . . . . . . . : 255.255.255.0   Lease Obtained. . . . . . . . . . : Friday, May 21, 2021 8:55:25 PM   Lease Expires . . . . . . . . . . : Saturday, May 21, 2022 8:55:25 PM   Default Gateway . . . . . . . . . :   DHCP Server . . . . . . . . . . . : 10.8.0.254   DHCPv6 IAID . . . . . . . . . . . : 184614680   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-28-38-63-9A-02-00-00-F8-D9-D4   DNS Servers . . . . . . . . . . . : 213.186.33.99                                       213.186.33.199   NetBIOS over Tcpip. . . . . . . . : Enabled

Debian 10:

0.0.0.0/1 via 10.8.0.1 dev tun0 default via 51.195.234.254 dev eth0 onlink 10.8.0.0/24 dev tun0 proto kernel scope link src 10.8.0.2 128.0.0.0/1 via 10.8.0.1 dev tun0

Windows ping when connected:

C:\Users\Administrator>ping 10.8.0.1

Pinging 10.8.0.1 with 32 bytes of data:Reply from 10.8.0.1: bytes=32 time=4ms TTL=64Reply from 10.8.0.1: bytes=32 time=4ms TTL=64Reply from 10.8.0.1: bytes=32 time=4ms TTL=64Reply from 10.8.0.1: bytes=32 time=4ms TTL=64Ping statistics for 10.8.0.1:    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds:    Minimum = 4ms, Maximum = 4ms, Average = 4ms

Linux Ping:

ping 10.8.0.1PING 10.8.0.1 (10.8.0.1) 56(84) bytes of data.--- 10.8.0.1 ping statistics ---5 packets transmitted, 0 received, 100% packet loss, time 3999ms