What is WU-0x80070643?
WU-0x80070643 shows up as a medium-severity Windows operating system fault. Windows cannot check for or install updates. Error code: 0x80070643. The usual suspects are corrupt SoftwareDistribution folder and stopped BITS service. Work through the steps below in order.
Common Causes
- Corrupt SoftwareDistribution folder
- Stopped BITS service
- Error connecting to server
Step-by-Step Fix Guide
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1
Restart Windows Update
Restart Windows Update is the first thing worth trying, since it resolves WU-0x80070643 for most affected systems.
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2
Clear the update cache
Not every case resolves on the first try; the steps that follow cover rarer windows instability situations.
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3
Run the WU Troubleshooter
"Run the WU Troubleshooter" covers a less common but documented cause of WU-0x80070643.
Commands & Diagnostics
net stop wuauserv
net stop bits
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Frequently Asked Questions
The leading cause of WU-0x80070643 is corrupt SoftwareDistribution folder, though stopped BITS service and error connecting to server also show up in our reports.
"Restart Windows Update" clears up most WU-0x80070643 reports by itself. The remaining steps above cover what's left.
WU-0x80070643 is a medium-severity issue. It can affect system stability, but the fix steps above typically resolve it without lasting damage.
In most cases, yes — the guide above resolves WU-0x80070643 without a clean install. Treat a reinstall as the last resort, not the first move.
Sometimes. Microsoft regularly releases patches that fix known BSOD triggers including WU-0x80070643. Make sure Windows is fully up to date via Settings → Windows Update before attempting more advanced fixes.
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