Servers for Tunnelblick 3.5.25

[the.one.dda 2]

Hi, I have an old MacBook Air 1.1 that I plan to use for accessing a single specific website via a VPN (I know it's extremely old, but it’s good enough for this job). I successfully installed Tunnelblick 3.5.25, but I still can’t reach the servers. Any ideas? Here’s the log:

2026-06-08 14:09:41 *Tunnelblick: OS X 10.5.1; Tunnelblick 3.5.25 (build 4270.5160)

2026-06-08 14:09:42 *Tunnelblick: Attempting connection with AirCanTCP using shadow copy; Set nameserver = 1; monitoring connection

2026-06-08 14:09:42 *Tunnelblick: openvpnstart start AirCanTCP.tblk 1337 1 0 1 0 82225 -ptADGNWradsgnw 2.3.18

2026-06-08 14:09:43 *Tunnelblick:

 

Could not start OpenVPN (openvpnstart returned with status #251)

 

Contents of the openvpnstart log:

*Tunnelblick: openvpnstart log:

     Loading tun-20090913.kext

     stdout from kextload: kextload: /Applications/Tunnelblick.app/Contents/Resources/tun-20090913.kext loaded successfully

     Launching the 32-bit Intel version of OpenVPN instead of default version for this CPUOpenVPN returned with status 1, errno = 13:

          Permission denied

    

     Command used to start OpenVPN (one argument per displayed line):

    

          /Applications/Tunnelblick.app/Contents/Resources/openvpn/openvpn-2.3.18/openvpn

          -i386

          /Applications/Tunnelblick.app/Contents/Resources/openvpn/openvpn-2.3.18/openvpn

          --daemon

          --log

          /Library/Application Support/Tunnelblick/Logs/-SUsers-SDDA-SLibrary-SApplication Support-STunnelblick-SConfigurations-SAirCanTCP.tblk-SContents-SResources-Sconfig.ovpn.1_0_1_0_82225.1337.openvpn.log

          --cd

          /Library/Application Support/Tunnelblick/Users/DDA/AirCanTCP.tblk/Contents/Resources

          --config

          /Library/Application Support/Tunnelblick/Users/DDA/AirCanTCP.tblk/Contents/Resources/config.ovpn

          --cd

          /Library/Application Support/Tunnelblick/Users/DDA/AirCanTCP.tblk/Contents/Resources

          --management

          127.0.0.1

          1337

          /Library/Application Support/Tunnelblick/ilbnekodoneaehkkgkbnogadfabnihioghaecfoj.mip

          --management-query-passwords

          --management-hold

          --script-security

          2

          --up

          /Applications/Tunnelblick.app/Contents/Resources/client.up.tunnelblick.sh -d -f -m -w -ptADGNWradsgnw

          --down

          /Applications/Tunnelblick.app/Contents/Resources/client.down.tunnelblick.sh -d -f -m -w -ptADGNWradsgnw

    

     Contents of the OpenVPN log:

    

          Options error: Unrecognized option or missing parameter(s) in /Library/Application Support/Tunnelblick/Users/DDA/AirCanTCP.tblk/Contents/Resources/config.ovpn:22: data-ciphers (2.3.18)

          Use --help for more information.

          

     More details may be in the Console Log's "All Messages"

 

                                        Options error: Unrecognized option or missing parameter(s) in /Library/Application Support/Tunnelblick/Users/DDA/AirCanTCP.tblk/Contents/Resources/config.ovpn:22: data-ciphers (2.3.18)

                                        Use --help for more information.

2026-06-08 14:09:42 *Tunnelblick: openvpnstart starting OpenVPN

[Staff 10547]

Hello!

The critical error:

Quote

Options error: Unrecognized option or missing parameter(s) in /Library/Application Support/Tunnelblick/Users/DDA/AirCanTCP.tblk/Contents/Resources/config.ovpn:22: data-ciphers (2.3.18)

OpenVPN 2.3.18 is very old and doesn't support "data-ciphers" directive which is included in configuration files for OpenVPN 2.5 and higher version. Try to generate a configuration file for OpenVPN 2.4 (*), but more importantly upgrade Tunnelblick, if possible, to a version that runs at least OpenVPN 2.4 (if possible go straight to OpenVPN 2.7). See here a thorough list of versions and pick the most recent one that's supported by your macOS:
https://tunnelblick.net/cRlsNotes.html

(*) OpenVPN 2.4 is also very old and abandoned but AirVPN will still support it during 2026. In the Config Generator page please turn on the "Advanced" switch, then select "2.4" on the OpenVPN profile combo box. Then generate and download as usual. The first Tunnelblick release featuring OpenVPN 2.4 is Tunnelblick 3.6.10: https://tunnelblick.net/cRlsNotesOld.html

Kind regards