Error on Mac M1; data channel cipher negotiation failed

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luiztomaz28
OpenVpn Newbie
Posts: 1
Joined: Fri Jan 20, 2023 8:47 pm

Error on Mac M1; data channel cipher negotiation failed

Post by luiztomaz28 » Fri Jan 20, 2023 8:50 pm

Can anyone tell me about this error. Mac M1.
daat channel cipher negotiation failed (no shared cipher)

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openvpn_inc
OpenVPN Inc.
Posts: 1116
Joined: Tue Feb 16, 2021 10:41 am

Re: Error on Mac M1; data channel cipher negotiation failed

Post by openvpn_inc » Wed Jan 25, 2023 10:22 pm

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
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Answers provided by OpenVPN Inc. staff members here are provided on a voluntary best-effort basis, and no rights can be claimed on the basis of answers posted in this public forum. If you wish to get official support from OpenVPN Inc. please use the official support ticket system: https://openvpn.net/support

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