Nxaudio.kext wont load on El Capitan due to kext signing

[devilmickey]

Tried to load the nxaudio.kext (5.0.43) on latest OSX failed with the following message, thus no audio redirect available:

# kextutil /System/Library/Extensions/nxaudio.kext

Diagnostics for /System/Library/Extensions/nxaudio.kext:

Code Signing Failure: not code signed

Untrusted kexts are not allowed

ERROR: invalid signature for com.nomachine.driver.nxau, will not load

[zaq]

Hello,

We aren’t able to reproduce your problem in our lab. We need more
details. Could you run below commands and send output to
forum[at]nomachine[dot]com, please?

1) /Applications/NoMachine.app/Contents/Frameworks/bin/nxserver --version

2) system_profiler SPSoftwareDataType

3) codesign -vvv /System/Library/Extensions/nxaudio.kext/

4) find /System/Library/Extensions/nxaudio.kext/ -type f -exec md5 {} \;

• This reply was modified 9 years ago by zaq.
• This reply was modified 9 years ago by zaq.
• This reply was modified 9 years ago by zaq.

[devilmickey]

Hi Zag,

Some input for your reference (computer name removed). Thanks.

$ /Applications/NoMachine.app/Contents/Frameworks/bin/nxserver –version

NoMachine – Version 5.0.43

$ system_profiler SPSoftwareDataType

Software:

System Software Overview:

System Version: OS X 10.11 (15A284)

Kernel Version: Darwin 15.0.0

Boot Volume: Macintosh

Boot Mode: Normal

Computer Name:

User Name: ()

Secure Virtual Memory: Enabled

Time since boot: 2:54

$ codesign -vvv /System/Library/Extensions/nxaudio.kext/

/System/Library/Extensions/nxaudio.kext/: code object is not signed at all

In architecture: x86_64

$ find /System/Library/Extensions/nxaudio.kext/ -type f -exec md5 {} \;

MD5 (/System/Library/Extensions/nxaudio.kext//Contents/_CodeSignature/CodeResources) = 4d1eb39ffdfb2323a2c1242b77cdd3a9

MD5 (/System/Library/Extensions/nxaudio.kext//Contents/Info.plist) = c71f9dac02c2d7d30c8e4ada8967aaf7

MD5 (/System/Library/Extensions/nxaudio.kext//Contents/MacOS/nxaudio) = 7a65bb9bc6f7d5e16d1a8da913608802

[zaq]

Hello,

Unfortunately it’s a bug. It’ll be fixed in a next release.
Old kext wasn’t replaced during update.

As a workaround you can do this:

1. Uninstall NoMachine:

sudo rm -rf /Applications/NoMachine.app

2. Install again the newest package.

[devilmickey]

Hi Zag,

It works, thank you.

[Author]

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