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Error on Mac M1; data channel cipher negotiation failed
Posted: Fri Jan 20, 2023 8:50 pm
by luiztomaz28
Can anyone tell me about this error. Mac M1.
daat channel cipher negotiation failed (no shared cipher)
Re: Error on Mac M1; data channel cipher negotiation failed
Posted: Wed Jan 25, 2023 10:22 pm
by openvpn_inc
Hello luiztomaz28,
The OpenVPN server has a list of allowed encryption ciphers. The OpenVPN client has a list of allowed encryption ciphers. If they have at least one cipher that they can both agree on, then that one will be used. If there are more, the server will decide which one is best to use.
In your case, there is no agreement between server and client on supported ciphers. So the server for example wants either one of the ciphers A, B, or C, but your client is only offering cipher D. There's no match. So your OpenVPN configuration could use some work.
If you're using OpenVPN Access Server you should open a support ticket on
https://openvpn.net/support/ and we'll try to help you to get things working. If not then we can move this topic to the open source section of the forum and see if anyone has some suggestion what would need to be changed in your configuration to get your server and client to agree on a cipher.
Kind regards,
Johan