![]() ![]() For example, to unload, type the following: To unload system extensions and allow Tunnelblick to load its own system extensions, use the kextunload Terminal command to unload each loaded Tun and Tap system extension individually. ![]() But any non-Apple system extension with "tun" or "tap" in its name is likely to be causing the problem, and system extensions with other names might be causing the problem. net.sf.tuntaposx.tap and net.sf.tuntaposx.tun: These are from tuntaposx.anchorfree.tun: This system extension is associated withHotSpot Shield VPN.: This system extension is associated with Pogoplug.and : These are system extensions used by the Viscosity VPN client.Cisco's installer causes it to be loaded when the computer starts. : This is Cisco An圜onnect SSL VPN system extension.If Tunnelblick detects them, it will offer to unload them before connecting. foo.tun and foo.tap: These are system extensions for obsolete Cisco and Tunnelblick VPN clients (and some others), loaded when a very old version of Tunnelblick is launched (and unloaded when the computer restarts).Which version Tunnelblick uses depends on the version of macOS being used. Tunnelblick uses customized versions of the system extensions from tuntaposx, modified to have a Tunnelblick bundle ID and version. Since macOS 10.6.8, Tun connections do not need to have a system extension loaded unless they include a "dev-node tun" OpenVPN option. ![]() When needed, the appropriate one (Tun or Tap) is loaded when a connection is requested, and unloaded when it is disconnected. and : These are the system extensions used by current versions of Tunnelblick.Usually the Tun and/or tap system extensions show up at or near the end of the list. It will list all of the non-Apple system extensions that are loaded. To find out if an incompatible system extension is causing the problem, use the kextstat | grep -v com.apple command in a Terminal window. "Security" programs also may load incompatible system extensions.) (Some non-VPN software also loads incompatible system extensions - for example, Pogoplug loads a "" Tun system extension which interferes with Tunnelblick's Tun system extension. However, some other VPN clients (CiscoAn圜onnect SSL VPN, for example) load their own, incompatible system extensions when the computer is started and leave them loaded, whether or not a VPN connection is in use. Recent versions of Tunnelblick try to be "good citizens" by loading system extensions only when needed, and unloading them when they are no longer needed. (2) There may be incompatible system extensions already loaded. If you are using macOS High Sierra or Mojave, see Tunnelblick on macOS High Sierra and macOS Mojave.If you are using macOS Catalina, see Tunnelblick on macOS Catalina.If you are using macOS Big Sur, see Tunnelblick on macOS Big Sur.If you are using an Apple Silicon Mac, see Tunnelblick and Apple Silicon.(1) Your version of macOS did not allow the system extension to load or you did not give permission for the system extension to load: There are two possible causes for this message: Tunnelblick was not able to load a system extension that is needed to connect. Tunnelblick was not able to load a device driver (kext) that is needed to connect. If you see a message similar to one of the following: If you are using a Tap VPN, Tunnelblick must load a system extension for your VPN to operate.Įrrors Messages When Loading System Extensions If your VPN requires the Tun system extension, you can – and should – modify your OpenVPN configuration file so the system extension will not be required. (Note: Apple previously used the terms "kext" and "kernel extension" but now uses the term "system extension".) Tunnelblick may try to load a system extension to control the VPN tunnel. Important: See The Future of Tun and Tap VPNs on macOS for information about changes to future versions of macOS. ![]()
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