This consists of /System/Library/Extensions/tuxlerext.kext, /System/Library/ExtensionTuxler/tuxlerext.kext, /Library/LaunchAgents/, /Library/LaunchDaemons/ and the app itself /Applications/Tuxler.app. Tuxler: version 1 of the Tuxler VPN app known as version 1.0. The files which cause the conflict are installed at /Library/Sophos Anti-Virus/InterCheck.app/Contents/Resources/Sophos Anti-Virus.kext and /Library/Extensions/SophosOnAccessInterceptor.kext. Sophos Anti-Virus on-access scanner: old versions of the virus scanner known as versions 8 to 9.1. Razer Device Driver normally installed at /System/Library/Extensions/RazerHid.kext the extension known as version 6.25 Norton Internet Security Firewall Plugin normally at /Library/Application Support/Symantec/Daemon/SymDaemon.bundle/Contents/PlugIns/SymFirewall.bundle/Contents/Resources/SymFirewall.kext the extension known as versions 5.0 to 5.2. MediaTek RT2870 USB Wireless Driver normally installed at /System/Library/Extensions/RT2870USBWirelessDriver.kext the extension known as 2870USBWirelessDriver versions 4.1 to 4.2 These kernel extensions are generally old – most first caused problems in OS X Mavericks – and El Capitan should stop them from occurring, by blocking the incompatible extension. Objective-See’s KnockKnock is an excellent tool for inspecting your extensions, and checking that they are all above board. Even simple conflicts can make a Mac unusable, and a malware kernel extension would be catastrophic. Kernel extensions are vital – they include all the main hardware drivers which make your Mac work – but because they operate so close to the kernel, are an Achilles heel. XProtectPlistConfigData changes more frequently, the last update being on 9 July 2016, but its version number seems fixed at 1. The former data is seldom updated, and currently remains at version 3.30.1 of 5 April 2016. The list of blocked kernel extensions is split between Incompatible Kernel Extension Configuration Data, kept in /System/Library/Extensions/AppleKextExcludeList.kext, and XProtectPlistConfigData. El Capitan’s XProtect extends its coverage beyond simple malware, to block a long list of incompatible kernel extensions (KEXTs), and a shorter list of undesirable Safari extensions which I detailed here.
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