I fixed it by downgrading the OpenVPN version on the client side (AWS EC2 instance).
$ yum list openvpn
Loaded plugins: priorities, update-motd, upgrade-helper
1023 packages excluded due to repository priority protections
Installed Packages
openvpn.x86_64 2.3.14-1.el6 installed
Available Packages
openvpn.x86_64 2.4.3-1.19.amzn1 amzn-updates
Seems like AWS updates my AMI images at launch… I never did a yum update.
Is this fix a big security issue?
Will it all work out if I update my present main Netgate pfSense AWS instance to 2.3.4? Will it generate the roght configs to work with OpenVPN 2..4.3 ?
Thank you,
JP