09-29-2019, 08:46 PM
Use the same cipher as its configured in server.conf. Check you server configuration in /etc/openvpn/server.conf and check the cipher listed there and make sure it matches with your client .ovpn file. It can be also an openssl problem as since you updated the server the openssl got upgraded and the openvpn might not support it yet. I suggest rolling back the change of openvpn or downgrade it to a lower version using make (google it).
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