Hi everyone. I'm trying to roll out Cybereason sensors across our estate and hitting a wall with our old Windows Server 2012 R2 systems. The deployment just... fails. No error pop-ups, nothing clear in the Deployment UI.
I see the sensor installer kick off in Task Manager, but then it just vanishes and the machine never appears as protected. Checked the usual logs but I'm a bit lost. Has anyone else dealt with this? Is there a known compatibility issue or a specific prerequisite I'm missing for 2012 R2? Any help for a beginner would be awesome 😅
Yeah, I've seen weird stuff on 2012 R2 before. It could be a .NET Framework version issue. Did you check if the right version is installed? Sometimes the installer just quits if a dependency is missing but doesn't log it well.
Also, maybe check the Application and System logs in Event Viewer right after the installer vanishes. There's often a clue there the main program logs miss.
I'm curious, are you deploying via GPO or another method? That might make a difference.
Trying to figure it out.
I've run into similar silent failures on 2012 R2 deployments for other security tools, and it's almost always a prerequisite check failing. The Cybereason sensor has some very specific Windows dependencies beyond just .NET.
First, confirm you have the Universal C Runtime update installed (KB2999226). The sensor installer often requires this, and its absence causes an immediate, silent exit. Also, double-check that Windows Management Framework 5.1 is present; the deployment communication often depends on newer PowerShell components.
Can you share which deployment method you're using? The fix path differs if it's a manual install, GPO, or something like SCCM. For GPO, I've had to explicitly set the installer to run with higher integrity levels via a scheduled task wrapper on these older servers.
2012 R2, eh? Classic. You'll chase ghost errors for days.
First thing I'd try is running the installer from an admin cmd shell, not the GUI or a GPO script. Redirect stdout and stderr to a file. You'll often catch the real error there when everything else is silent.
```
your_installer.exe /quiet > C:install.log 2>&1
```
If that doesn't spit out a clue, check the temp directory (%TEMP%) for a verbose MSI log. The installer might be a wrapper that extracts and runs an MSI that fails and cleans up after itself.
Beyond that, the other replies about prerequisites are probably right. These security vendors build for Win10/Server 2016+ and treat 2012 R2 as an afterthought.
Keep it simple