If you really need to use an unsupported OpenVPN 2.3 (or even older) release and need to stay on BF-CBC (not recommended), the OpenVPN 2.5 based client will need a config file change to re-enable BF-CBC. If upgrading is not possible we recommend adding data-ciphers AES-256-GCM:AES-128-GCM:AES-128-CBC (for v2.5+) or cipher AES-128-CBC (v2.4.x and older) to the configuration of all clients and servers. Generally, we recommend upgrading such setups to OpenVPN 2.4 or v2.5. Unless BF-CBC is included in -data-ciphers or there is a "-cipher BF-CBC" in the OpenVPN 2.5 config, a v2.5 client or server will refuse to talk to a v2.3 server or client, because it has no common data channel cipher and negotiating a cipher is not possible. By default they will select one of the AES-GCM ciphers, but this can be influenced using the -data-ciphers setting.Ĭonnections between OpenVPN 2.3 and v2.5 that have no -cipher setting in the config (= defaulting to BF-CBC and not being negotiation-capable) must be updated. BF-CBC is still available, but it needs to be explicitly configured now.įor connections between OpenVPN 2.4 and v2.5 clients and servers, both ends will be able to negotiate a better cipher than BF-CBC.
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