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@kindlittlebird

OpenVPN 接続時 failed to negotiate cipher with server になる

Last updated at Posted at 2023-10-13

概要

  • Windows11 でOpenVPNを使って接続を試したところ、下記のエラーが赤字で表示されて接続できない
2023-10-13 13:07:20 OPTIONS ERROR: failed to negotiate cipher with server.  Add the server's cipher ('AES-128-CBC') to --data-ciphers (currently 'AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305') if you want to connect to this server.
2023-10-13 13:07:20 ERROR: Failed to apply push options
2023-10-13 13:07:20 Failed to open tun/tap interface
  • ※iPhoneアプリでは問題なく接続できたので、サーバ側の設定は問題なさそうだった。

原因

  • 原因はOpenVPN 2.6系になってからOpenSSL 3.0 が使われるようになったようで、幾つかの cipher がデフォルトの設定がつかえなくなったらしい。

解決策

  • OpenVPNの接続用コンフィグの末尾に
data-ciphers AES-128-CBC

を記載するだけで解決する

参考サイト

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