I've ins talled a fresh CentOS 8 and added the openvpn functionality as follows:
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# dnf install openvpn
# yum install openvpn-devel.x86_64
# yum install NetworkManager-openvpn.x86_64 NetworkManager-openvpn-gnome.x86_64
I finally found the following log entries:
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$ journalctl -u NetworkManager --no-pager
Jan 18 11:55:03 maxwell NetworkManager[981]: <info> [1579344903.4589] audit: op="connection-activate" uuid="20378b68-9764-4f31-96a5-79200779a57e" name="lpprma-at-home" pid=2238 uid=1000 result="success"
Jan 18 11:55:03 maxwell NetworkManager[981]: <info> [1579344903.4681] vpn-connection[0x560936696100,20378b68-9764-4f31-96a5-79200779a57e,"lpprma-at-home",0]: Started the VPN service, PID 6461
Jan 18 11:55:03 maxwell NetworkManager[981]: <info> [1579344903.4881] vpn-connection[0x560936696100,20378b68-9764-4f31-96a5-79200779a57e,"lpprma-at-home",0]: Saw the service appear; activating connection
Jan 18 11:55:03 maxwell NetworkManager[981]: <info> [1579344903.5011] vpn-connection[0x560936696100,20378b68-9764-4f31-96a5-79200779a57e,"lpprma-at-home",0]: VPN plugin: state changed: starting (3)
Jan 18 11:55:03 maxwell NetworkManager[981]: <info> [1579344903.5011] vpn-connection[0x560936696100,20378b68-9764-4f31-96a5-79200779a57e,"lpprma-at-home",0]: VPN connection: (ConnectInteractive) reply received
Jan 18 11:55:03 maxwell nm-openvpn[6465]: WARNING: file '<edited>.pem' is group or others accessible
Jan 18 11:55:03 maxwell nm-openvpn[6465]: OpenVPN 2.4.8 x86_64-redhat-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Nov 1 2019
Jan 18 11:55:03 maxwell nm-openvpn[6465]: library versions: OpenSSL 1.1.1 FIPS 11 Sep 2018, LZO 2.08
Jan 18 11:55:03 maxwell nm-openvpn[6465]: WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.
Jan 18 11:55:03 maxwell nm-openvpn[6465]: NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Jan 18 11:55:03 maxwell nm-openvpn[6465]: TCP/UDP: Preserving recently used remote address: [AF_INET]<ip address edited>:1194
Jan 18 11:55:03 maxwell nm-openvpn[6465]: UDP link local: (not bound)
Jan 18 11:55:03 maxwell nm-openvpn[6465]: UDP link remote: [AF_INET]<ip address edited>:1194
Jan 18 11:55:03 maxwell nm-openvpn[6465]: NOTE: UID/GID downgrade will be delayed because of --client, --pull, or --up-delay
Jan 18 11:55:03 maxwell nm-openvpn[6465]: TLS error: Unsupported protocol. This typically indicates that client and server have no common TLS version enabled. This can be caused by mismatched tls-version-min and tls-version-max options on client and server. If your OpenVPN client is between v2.3.6 and v2.3.2 try adding tls-version-min 1.0 to the client configuration to use TLS 1.0+ instead of TLS 1.0 only
Jan 18 11:55:03 maxwell nm-openvpn[6465]: OpenSSL: error:1425F102:SSL routines:ssl_choose_client_version:unsupported protocol
Jan 18 11:55:03 maxwell nm-openvpn[6465]: TLS_ERROR: BIO read tls_read_plaintext error
Jan 18 11:55:03 maxwell nm-openvpn[6465]: TLS Error: TLS object -> incoming plaintext read error
Jan 18 11:55:03 maxwell nm-openvpn[6465]: TLS Error: TLS handshake failed
Jan 18 11:55:03 maxwell nm-openvpn[6465]: SIGUSR1[soft,tls-error] received, process restarting
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$ openssl ciphers -v 'TLSv1.2' | grep AES
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(256) Mac=SHA384
ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA384
DHE-DSS-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(256) Mac=AEAD
DHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-RSA-AES256-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(256) Mac=SHA256
DHE-DSS-AES256-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AES(256) Mac=SHA256
ADH-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=None Enc=AESGCM(256) Mac=AEAD
ADH-AES256-SHA256 TLSv1.2 Kx=DH Au=None Enc=AES(256) Mac=SHA256
ECDH-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AESGCM(256) Mac=AEAD
ECDH-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AESGCM(256) Mac=AEAD
ECDH-RSA-AES256-SHA384 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AES(256) Mac=SHA384
ECDH-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AES(256) Mac=SHA384
AES256-GCM-SHA384 TLSv1.2 Kx=RSA Au=RSA Enc=AESGCM(256) Mac=AEAD
AES256-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA256
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA256
ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA256
DHE-DSS-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(128) Mac=AEAD
DHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-RSA-AES128-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(128) Mac=SHA256
DHE-DSS-AES128-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AES(128) Mac=SHA256
ADH-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=None Enc=AESGCM(128) Mac=AEAD
ADH-AES128-SHA256 TLSv1.2 Kx=DH Au=None Enc=AES(128) Mac=SHA256
ECDH-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AESGCM(128) Mac=AEAD
ECDH-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AESGCM(128) Mac=AEAD
ECDH-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AES(128) Mac=SHA256
ECDH-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AES(128) Mac=SHA256
AES128-GCM-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AESGCM(128) Mac=AEAD
AES128-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA256
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$ openssl ciphers -v 'TLSv1.2' | grep AES
TLS_AES_256_GCM_SHA384 TLSv1.3 Kx=any Au=any Enc=AESGCM(256) Mac=AEAD
TLS_AES_128_GCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESGCM(128) Mac=AEAD
TLS_AES_128_CCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESCCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-DSS-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(256) Mac=AEAD
DHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES256-CCM8 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM8(256) Mac=AEAD
ECDHE-ECDSA-AES256-CCM TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM(256) Mac=AEAD
DHE-RSA-AES256-CCM8 TLSv1.2 Kx=DH Au=RSA Enc=AESCCM8(256) Mac=AEAD
DHE-RSA-AES256-CCM TLSv1.2 Kx=DH Au=RSA Enc=AESCCM(256) Mac=AEAD
ADH-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=None Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-DSS-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(128) Mac=AEAD
DHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES128-CCM8 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM8(128) Mac=AEAD
ECDHE-ECDSA-AES128-CCM TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM(128) Mac=AEAD
DHE-RSA-AES128-CCM8 TLSv1.2 Kx=DH Au=RSA Enc=AESCCM8(128) Mac=AEAD
DHE-RSA-AES128-CCM TLSv1.2 Kx=DH Au=RSA Enc=AESCCM(128) Mac=AEAD
ADH-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=None Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA384
ECDHE-RSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(256) Mac=SHA384
DHE-RSA-AES256-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(256) Mac=SHA256
DHE-DSS-AES256-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AES(256) Mac=SHA256
ADH-AES256-SHA256 TLSv1.2 Kx=DH Au=None Enc=AES(256) Mac=SHA256
ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA256
ECDHE-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA256
DHE-RSA-AES128-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(128) Mac=SHA256
DHE-DSS-AES128-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AES(128) Mac=SHA256
ADH-AES128-SHA256 TLSv1.2 Kx=DH Au=None Enc=AES(128) Mac=SHA256
RSA-PSK-AES256-GCM-SHA384 TLSv1.2 Kx=RSAPSK Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-PSK-AES256-GCM-SHA384 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESGCM(256) Mac=AEAD
DHE-PSK-AES256-CCM8 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM8(256) Mac=AEAD
DHE-PSK-AES256-CCM TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM(256) Mac=AEAD
AES256-GCM-SHA384 TLSv1.2 Kx=RSA Au=RSA Enc=AESGCM(256) Mac=AEAD
AES256-CCM8 TLSv1.2 Kx=RSA Au=RSA Enc=AESCCM8(256) Mac=AEAD
AES256-CCM TLSv1.2 Kx=RSA Au=RSA Enc=AESCCM(256) Mac=AEAD
PSK-AES256-GCM-SHA384 TLSv1.2 Kx=PSK Au=PSK Enc=AESGCM(256) Mac=AEAD
PSK-AES256-CCM8 TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM8(256) Mac=AEAD
PSK-AES256-CCM TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM(256) Mac=AEAD
RSA-PSK-AES128-GCM-SHA256 TLSv1.2 Kx=RSAPSK Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-PSK-AES128-GCM-SHA256 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESGCM(128) Mac=AEAD
DHE-PSK-AES128-CCM8 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM8(128) Mac=AEAD
DHE-PSK-AES128-CCM TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM(128) Mac=AEAD
AES128-GCM-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AESGCM(128) Mac=AEAD
AES128-CCM8 TLSv1.2 Kx=RSA Au=RSA Enc=AESCCM8(128) Mac=AEAD
AES128-CCM TLSv1.2 Kx=RSA Au=RSA Enc=AESCCM(128) Mac=AEAD
PSK-AES128-GCM-SHA256 TLSv1.2 Kx=PSK Au=PSK Enc=AESGCM(128) Mac=AEAD
PSK-AES128-CCM8 TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM8(128) Mac=AEAD
PSK-AES128-CCM TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM(128) Mac=AEAD
AES256-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA256
AES128-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA256
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ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-DSS-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(256) Mac=AEAD
DHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(256) Mac=AEAD
ADH-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=None Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-DSS-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(128) Mac=AEAD
DHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(128) Mac=AEAD
ADH-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=None Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA384
ECDHE-RSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(256) Mac=SHA384
DHE-RSA-AES256-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(256) Mac=SHA256
DHE-DSS-AES256-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AES(256) Mac=SHA256
ADH-AES256-SHA256 TLSv1.2 Kx=DH Au=None Enc=AES(256) Mac=SHA256
ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA256
ECDHE-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA256
DHE-RSA-AES128-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(128) Mac=SHA256
DHE-DSS-AES128-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AES(128) Mac=SHA256
ADH-AES128-SHA256 TLSv1.2 Kx=DH Au=None Enc=AES(128) Mac=SHA256
AES256-GCM-SHA384 TLSv1.2 Kx=RSA Au=RSA Enc=AESGCM(256) Mac=AEAD
AES128-GCM-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AESGCM(128) Mac=AEAD
AES256-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA256
AES128-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA256