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OPTIONS ERROR: Failed to negotiate with cypher #381
Comments
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Hi,
On Fri, Nov 13, 2020 at 01:31:08PM -0800, mcrite wrote:
I get this same error over and over again when trying to connect with multiple profiles. Any assistance would be great.
2020-11-13 16:05:38 OPTIONS ERROR: failed to negotiate cipher with server. Configure --data-ciphers-fallback if you want to connect to this server.
2020-11-13 16:05:38 ERROR: Failed to apply push options
2020-11-13 16:05:38 Failed to open tun/tap interface
2020-11-13 16:05:38 SIGUSR1[soft,process-push-msg-failed] received, process restarting
2020-11-13 16:05:38 Restart pause, 5 second(s)
This is not an openvpn-gui bug, it's just a misconfiguration of the
client or server.
Questions like this are better suited for the openvn-users list or the
openvpn community forum (https://forums.openvpn.net). Include a log
file with "verb 3" so we can see the client version (looks like 2.5.0)
and what options the server pushed.
If connecting to a commercial VPN service, this is a question their
support needs to answer (many of those providers modify openvpn,
some in incompatible ways).
gert
…--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany gert@greenie.muc.de
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Sat Feb 27 17:04:47 2021 SENT CONTROL [ALIYUN-server]: 'PUSH_REQUEST' (status=1) |
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Hi,
On Sat, Feb 27, 2021 at 01:05:24AM -0800, bjhdtv wrote:
Sat Feb 27 17:04:47 2021 OPTIONS ERROR: failed to negotiate cipher with server. Add the server's cipher ('BF-CBC') to --data-ciphers (currently 'AES-256-GCM:AES-128-GCM') if you want to connect to this server.
This. Do what it tells you.
(*Or* upgrade the server to something less ancient - with 2.4 and up on
the server, you get AES-GCM ciphers, which are more performant *and* more
secure)
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany gert@greenie.muc.de
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Which file should I add 'BF-CBC' to?I cannot find the file which has -data-ciphers (currently 'AES-256-GCM:AES-128-GCM') . |
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The option goes to the config file. The log is reporting the default values so you may not have any Continuing to use a weak cipher like BF-CBC should be avoided. |
for this Error#[(ERROR: failed to negotiate cipher with server. Add the server's cipher ('BF-CBC') to --data-ciphers (currently 'AES-256-GCM:AES-128-GCM') if you want to connect to this server.)] |
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Hi,
On Mon, Jun 07, 2021 at 06:39:22AM -0700, Liang wrote:
> I get this same error over and over again when trying to connect with multiple profiles. Any assistance would be great.
>
> 2020-11-13 16:05:38 OPTIONS ERROR: failed to negotiate cipher with server. Configure --data-ciphers-fallback if you want to connect to this server.
> 2020-11-13 16:05:38 ERROR: Failed to apply push options
> 2020-11-13 16:05:38 Failed to open tun/tap interface
> 2020-11-13 16:05:38 SIGUSR1[soft,process-push-msg-failed] received, process restarting
> 2020-11-13 16:05:38 Restart pause, 5 second(s)
# for this Error
#[(ERROR: failed to negotiate cipher with server. Add the server's cipher ('BF-CBC') to --data-ciphers (currently 'AES-256-GCM:AES-128-GCM') if you want to connect to this server.)]
ncp-ciphers "BF-CBC"
OpenVPN-GUI github is not the place to handle openvpn config questions.
That said: just do what it tells you. Add "BF-CBC" to "data-ciphers", as
in "put the following into your config":
data-ciphers AES-256-GCM:AES-128-GCM:BF-CBC
(and then upgrade the server to something which is not 10 years old)
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany ***@***.***
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add the following config to your openvpn configruation file: |
I think yo have to upgrade your openvpn server package to the latest repository. It's work for me. Greetings from Indonesia |
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Note that what @yunnysunny says works with 2.5 but will also stop working with 2.6 as --cipher is deprecated. |
thanks it's useful for me , thank you very much ! if someone have this problem, pls add cipher BF-CBC to your file "xxxx.ovpn" |
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Instead of blindly adding directives, reading https://github.com/OpenVPN/openvpn/blob/master/doc/man-sections/cipher-negotiation.rst and understanding what is happening is the better alternative. |
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Hi,
On Thu, Dec 02, 2021 at 03:18:29AM -0800, huangjiayegithub wrote:
if someone have this problem, pls add cipher BF-CBC to your file "xxxx.ovpn"
This is actually bad advice, as it will stop working in 2.6
-> if you have this problem, do what was stated before
- upgrade the server to 2.4 or higher (2.3 is ANCIENT)
- if that is not possible, add BF-CBC to the list in --data-ciphers,
in your config (or add that line), as in
data-ciphers AES-256-GCM:AES-128-GCM:BF-CBC
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany ***@***.***
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where should i finf config file in kali . /etc/openvpn ? |
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The cipher is not added correctly or something, so I had to modify the .ovpn file manually, if you open the file you'll see just change it to - |
Thank you. It works for me. |
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Unfortunately, "put the following into your config" isn't enough to resolve this, so following "Questions like this are better suited for the openvn-users list or the openvpn community forum" I've asked at https://forums.openvpn.net/viewtopic.php?t=35283 . |
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"put the following into your config" means, open the config file and add the suggested line to it. If the config is in the user's profile, you can do this from the GUI by clicking the menu item named If the config is in the global config directory, or if not sure, try the same as above. If saving succeeds, you are done. Otherwise you will get a permission denied error while trying to save the file. If that happens, note down the location of the file listed in the error message that pops up, and edit it directly with admin privileges. Note: Instead of "adding" you can also replace the corresponding option line if it already exists in the file --- in this case that would be the line starting |
goodBoy,it's useful |
How to fix this issue?My Command -
Error massages -
Solution of this issueJust run this command -
Then try again to connect openVPN -
Hope it works for everyone 👍 This problem is not happened by openVPN. It occurs by ovpn file provider. |
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Hi,
On Tue, Feb 14, 2023 at 03:52:11AM -0800, MD Nazmul Haque wrote:
> `2023-02-14 17:35:47 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.`
> `2023-02-14 17:35:47 ERROR: Failed to apply push options`
> `2023-02-14 17:35:47 Failed to open tun/tap interface`
> `2023-02-14 17:35:47 SIGUSR1[soft,process-push-msg-failed] received, process restarting`
> `2023-02-14 17:35:47 Restart pause, 1 second(s)`
Please help me!
Strictly speaking, this is not an OpenVPN bug, but a VPN provider that
is not operating correctly - the provider's server is sending you a
cipher ("PUSH_REPLY cipher AES-256-CBC") that the client is not willing
to accept, and has not signalled(!) to the server as "acceptable cipher".
To make this work, find the openvpn config file for that provider, open
it with a text editor ("notepad"), and add the line
data-ciphers AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305:AES-256-CBC
to the end.
Also, please do open a ticket with the VPN provider and tell them that
their configs are incompatible with OpenVPN 2.6.0 and that this was
known since at least a year...
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany ***@***.***
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Harry you are a wizzard! it worked for me thanks buddy |
Actually, this is bad advice. It will fix the immediate problem, but when the server side wants to upgrade to AEAD ciphers (AES-256-GCM, Chacha-Poly) your suggestion will break the setup again because this disallows use of these more modern ciphers. So the suggestion should always be to append non-default ciphers to the data-ciphers line, so this would be
as a replacement for the
(and someone with a bit more time and scripting experience could extend this to cover "any cipher xxx line", of course) |
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Or add |
Thank you so much!!! |
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The cause of the error is that the configuration file you are using is not compatible with the server you are connecting to. You have to contact your server administrator for proper guidance and corrected config file. All the suggestions in this thread were aimed at users who may have the know-how to adapt the advice to match the errors they see in the logs. |
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Hi,
On Thu, Mar 30, 2023 at 07:28:54PM -0700, dangdkhanh wrote:
sr but these line not work ! @@
data-ciphers AES-256-GCM:AES-128-GCM:BF-CBC
ciphers AES-256-GCM
[..]
Fri Mar 31 09:27:47 2023 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.
You need to read what the log says: the server wants AES-128-CBC, and
this is not part of the "data-ciphers" list you have above. CBC is not GCM.
You need to add
data-ciphers AES-256-GCM:AES-128-GCM:AES-128-CBC
(or tell the server operator that CBC is really a thing of the past and
they should upgrade to GCM)
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany ***@***.***
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Work for me! thanks! |
This helped me mine was.
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For me this works: Server Version: Client Version: -- 1. On the server, in the Do NOT try to use AES-128-GCM, this is not supported by Ubuntu 16.04! 2. On the client, in the -- One more tip: Add |
It is highly recommended to never use an operating system or a SSL library on the public Internet that has run out of support years ago already (April 2021 for Ubuntu 16.04, and OpenSSL 1.0.2 had its official end of life in 2015). So please upgrade that server to 20.04 or 22.04 - and then you can just use the default AES-GCM cipher suite, which is faster, and does not need any extra config. |
You saved me! Cheers! |
Thank You. I faced the issue during my eCPPT exam. i changed it to and it worked. Thank You |
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removing the AEAD ciphers from trhe list will probably get you into trouble later. I would really recommend to keep them and instead use
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This has worked for me. Nothing to do anything else. |
I get this same error over and over again when trying to connect with multiple profiles. Any assistance would be great.
2020-11-13 16:05:38 OPTIONS ERROR: failed to negotiate cipher with server. Configure --data-ciphers-fallback if you want to connect to this server.
2020-11-13 16:05:38 ERROR: Failed to apply push options
2020-11-13 16:05:38 Failed to open tun/tap interface
2020-11-13 16:05:38 SIGUSR1[soft,process-push-msg-failed] received, process restarting
2020-11-13 16:05:38 Restart pause, 5 second(s)
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