I\'m trying to get Network Link Conditioner working on my machine that is running OS X Mavericks. I\'m running Developer Preview 8 (the latest as of this writing). I downloa
How I got it solved was:
It should be working fine now!
I was also having problems with Network Link Conditioner working after upgrading to Mavericks. For me the problem was the default security settings after the upgrade that prevented software from running unless it came form the Mac App Store.
Updating this setting:
System Settings > Security & Privacy > General > Allow apps downloaded from: > Anywhere
and reinstalling the Network Link Conditioner pref pane fixed it for me. Without this setting you can install and enable it, but it has no effect and silently fails.
On macOS Sierra v10.12.1 with Xcode 8.1, I tried a couple of the Hardware IO Tools for Xcode downloads. All of which resulted in a silent failure like @aidaan such that the Network Link Conditioner plain didn't do anything.
After finding this discussion, I uninstalled the previous Hardware IO Tools for Xcode components, and instead utilized the Additional Tools for Xcode 8.1 downloaded from the downloads page, the Network Link Conditioner in the Hardware directory for that .dmg worked perfectly.
Try re-installing it. It fixed the issue for me, though I was having different error messages.
Open System Preferences, right-click (or control-click) on the Network Link Conditioner and click "Remove Network Link Conditioner" to remove it.
In Xcode got to the Xcode menu -> Open Developer Tool -> More Developer Tools...
In the browser window that opens, grab the most recent Hardware IO tools .dmg
Double click the "Network Link Conditioner.prefPane" on the disk image to install it.