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VPN troubleshooting

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:CHACHA20-POLY1305') if you want to connect to this server.

Happens on Windows 11. In the client file change the line

ciphers AES-256-CBC

to

data-ciphers AES-256-CBC

See also

References