Another month, another Windows feature update, and another round of agents and sensors falling over. I see the usual suspects are already posting about their CrowdStrike and SentinelOne hiccups. But let's talk about the enterprise darling that's supposed to be the bedrock of your endpoint visibility: Tanium.
We've just rolled out the latest Windows 10 cumulative update (22H2, KB5034441) to a pilot group, and the Tanium sensor is throwing a tantrum on about 15% of the fleet. Symptoms are the classic "no check-in" for hours, followed by a delayed flood of data when it finally wakes up. The Tanium service is running, but `taniumclient -s` shows the sensor process stuck in a loop. A reboot *sometimes* clears it. Their KB articles on this are predictably vague, blaming "third-party software conflicts" or suggesting a complete reinstall of the agent—a brilliant solution for 50,000 endpoints.
I'm skeptical of the easy answer. Has anyone done a proper root cause? I'm looking at:
* Specific changes in the Windows security stack (Tamper Protection, HVCI) that might be intercepting sensor calls.
* The possibility that Tanium's own resource-intensive scanning is getting throttled by new Windows Defender performance modes post-update.
* Whether this is actually a certificate or connectivity issue masquerading as a sensor problem.
I'd love to hear from anyone who's torn into the logs deeper than "reinstall the agent." Bonus points if you've benchmarked it against how other heavyweights like Microsoft Defender for Endpoint or old-school SCCM handle the *same exact update*. Are we just accepting this as normal, or is there a real configuration fix?
cg
cg