Cannot connect to VPN Windows 10, looks like Blowfish depricated from the OpenVPN client recently

[Guest Roman]

It looks like there may be a cipher compatibility issue with newer versions of OpenVPN. I was only able to find 3 articles about this error and they were all within the last 30 days.

https://sourceforge.net/p/openvpn/mailman/message/37072072/

https://sourceforge.net/p/openvpn/mailman/openvpn-devel/?page=4

https://openvpn.net/vpn-server-resources/additional-security-command-line-options/#Change_the_encryption_cipher_for_server_and_client

This is my error

Sun Aug 30 21:56:27 2020 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.
Sun Aug 30 21:56:27 2020 ERROR: Failed to apply push options
Sun Aug 30 21:56:27 2020 Failed to open tun/tap interface

This looks to be in response to the SWEET32 Cipher flaw in 128 bit version of BlowFish - Source

https://fedoraproject.org/wiki/Changes/New_default_cipher_in_OpenVPN

I've been looking for a way to add this cipher to my configuration, but I haven't seen anything.

Please advise

 

 

 

 

 

[krisbowe 32]

Do you get the same error from a Kali VM connection via OpenVPN?

 

[StefanWAustin 343]

You have to downgrade your openVPN software on Windows. Using Windows does not make much sense, you can use Windows for the first lab, that is it.

[Guest Vitor]

I am also struggling with this problem, using Kali Linux. Tried to redownload VPN configuration file but it did not work. How can I downgrade my OpenVPN on kali to make it work?

[StefanWAustin 343]

On kali, use:

sudo openvpn --data-ciphers BF-CBC --config yourlabfile.ovpn

[Guest Tim]

For people who connect from Windows. I found a version that works without BlowFish error. it is openvpn-install-2.4.9-I601-Win10.exe. It spent 30 minutes looking for work around, wasted my time and money because the lab deduct my time. 

Link: https://build.openvpn.net/downloads/releases/openvpn-install-2.4.9-I601-Win10.exe

It is ridiculous the "Ask Support" button on member portal bring us to a forum instead of person who can help us, not even a service portal to log tickets.........worst, this forum doesn't have a section for MAP course.

[StefanWAustin 343]

1 hour ago, Guest Tim said:

"Ask Support" button on member portal bring us to a forum instead of person who can help us,

You can use the chat on Facebook or Twitter. Alternatively you can write an email to the support support@elearnsecurity.com. If you write an email, you will get your time back. 

[skuggar 0]

I was getting ready to take a test and stumbled across this issue while trying to visit a lab to practice something. The command line Caesar posted above works fine, but if you edit the ovpn like below, you can still use it through the network manager gui.

 

[Guest h8tingMS]

On 9/13/2020 at 6:56 AM, Guest Tim said:

For people who connect from Windows. I found a version that works without BlowFish error. it is openvpn-install-2.4.9-I601-Win10.exe. It spent 30 minutes looking for work around, wasted my time and money because the lab deduct my time. 

Link: https://build.openvpn.net/downloads/releases/openvpn-install-2.4.9-I601-Win10.exe

It is ridiculous the "Ask Support" button on member portal bring us to a forum instead of person who can help us, not even a service portal to log tickets.........worst, this forum doesn't have a section for MAP course.

Thanks. Worked great and saved me a lot of time trouble shooting.  

[Guest Sankii99]

I had same problem in Ubuntu 21.04 and resolved by adding following line to the openvpn conf file

Quote

cipher BF-CBC

 

[Guest Evg]

On 9/13/2020 at 1:56 PM, Guest Tim said:

For people who connect from Windows. I found a version that works without BlowFish error. it is openvpn-install-2.4.9-I601-Win10.exe. It spent 30 minutes looking for work around, wasted my time and money because the lab deduct my time. 

Link: https://build.openvpn.net/downloads/releases/openvpn-install-2.4.9-I601-Win10.exe

It is ridiculous the "Ask Support" button on member portal bring us to a forum instead of person who can help us, not even a service portal to log tickets.........worst, this forum doesn't have a section for MAP course.

Thank you! It is work for me!

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