-> downloaded filename.ovpn configuration from the watchguard webfrontend, after logon with the user and password

-> logon works with the official watchguard ssl-vpn client, but not with another openvpn client, the error message in the log file is:

OPTIONS ERROR: failed to negotiate cipher with server. Add the server's cipher ('AES-256-CBC') to --data-ciphers (currently 'AES-256-GCM:AES-128-GCM') if you want to connect to this server.

>> solution:
change one line in the configfile.ovpn file:
-- instead of line: cipher AES-256-CBC write the line:
>>>> data-cipers AES-256-CBC

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