= On Slackware, I get the error: Cipher algorithm 'BF-CBC' not found (OpenSSL) =
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<p>By default, OpenVPN uses the <em>blowfish</em> cipher for tunnel encryption. For some reason, some versions of Slackware have an OpenSSL library built without Blowfish cipher support.</p>
<p>The fix is either:</p>
<ul>
<li>Rebuild the OpenSSL library to include blowfish, or</li>
<li>use the <strong>--cipher</strong> option to choose a different cipher. The command <strong>openvpn --show-ciphers</strong> will show the available ciphers. For example <strong>--cipher DES-EDE3-CBC</strong> will select Triple-DES encryption.</li>
</ul>
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