What is SVC-FAIL-LanmanServer?
SVC-FAIL-LanmanServer shows up as a medium-severity Windows operating system fault. The LanmanServer service terminated unexpectedly. Services dependent on this process may not work. This usually traces back to blocked by antivirus and missing permission. Follow the steps below to fix it.
Common Causes
- Corrupt service registry keys
- Blocked by antivirus
- Missing permission
Step-by-Step Fix Guide
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1
Restart the service via services.msc
Begin with Restart the service via services.msc; it's the step that resolves SVC-FAIL-LanmanServer for the largest share of reported cases.
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2
Fix service permissions
If the fault persists, continue with the next steps, which account for less common windows instability causes.
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3
Restore system files
"Restore system files" is the next step worth ruling out for SVC-FAIL-LanmanServer.
Commands & Diagnostics
sc query LanmanServer
net start LanmanServer
Frequently Asked Questions
The leading cause of SVC-FAIL-LanmanServer is corrupt service registry keys, though blocked by antivirus and missing permission also show up in our reports.
The fastest fix is "Restart the service via services.msc". Only move on to the later steps if SVC-FAIL-LanmanServer keeps coming back.
SVC-FAIL-LanmanServer is a medium-severity issue. It can affect system stability, but the fix steps above typically resolve it without lasting damage.
You shouldn't need to. Work through the guide above first — a reinstall is only worth considering if none of those steps help.
Sometimes. Microsoft regularly releases patches that fix known BSOD triggers including SVC-FAIL-LanmanServer. Make sure Windows is fully up to date via Settings → Windows Update before attempting more advanced fixes.
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