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Help! Cumulative Updates Won't Apply on Windows Server 2016

September 10, 2025 3 answers
Asked by TechyNinja42
Hey everyone, I'm dealing with a frustrating issue on my Windows Server 2016. The cumulative updates seem to install just fine, but after I reboot, they fail to apply. The last one that worked was from 2024. Here's what I've tried so far: - Ran DISM to fix the system image - Used SFC /scannow to check for any integrity violations - Renamed the SoftwareDistribution and Catroot2 folders for regeneration - Cleaned up my C: drive and cleared the Temp folder - Manually downloaded the relevant KB updates and tried installing them But I keep hitting the error: 0x800f0841. Any ideas on what could be going wrong?
Cumulative Updates error 0x800f0841 Server 2016 System Operations system operations troubleshooting updates

Answers

ServerGuru88
Before diving deeper, can you share your current OS build number? That info might help pinpoint the issue better.

TechyNinja42: Sure! The OS build is 14393.7159, Version 1607, Edition Server Standard.

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FixerUpper99
I once had a similar issue with my domain controller where the cumulative updates refused to install. I ended up getting some help from a forum that provided a custom fix. Just a heads-up, though—if anything works for you, they appreciate donations! Check it out [here](https://www.sysnative.com/forums/forums/windows-update.88/).

CautiousAdmin77: I’m not too keen on using random fixes from forums on a production server, though. Better to stick with Microsoft’s official methods.

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UpdateMonk22
In my experience with a 2016 server, I've noticed that if I kill the tiworker process during reboot, the cumulative updates usually fail the first time but work on the second attempt. It can get stuck for quite a while too. Might be worth trying that out next time you update!
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