Medium
Operating Systems
✓ Solution Verified by Community (0+ upvotes)
How to fix error error-oplock-not-granted in Windows 11
ERROR_OPLOCK_NOT_GRANTED = 300
Fix based on community reports and expert analysis. Last verified: 2026-08-13
· How we verify fixes
| Error Code | error-oplock-not-granted |
|---|---|
| Affected System | Windows 11 (Microsoft) |
| Difficulty | Medium |
| Estimated Time | 30 min |
| Requires Admin Rights | ⚠️ Yes |
| Requires Reboot | 🔄 Yes |
Solution Steps
- 1 Press Windows key + R to open the Run dialog. Type 'cmd' and press Ctrl+Shift+Enter to open Command Prompt as administrator. Click Yes when prompted. This gives you the elevated privileges needed to run system-level commands.
- 2 In the Command Prompt, type 'sfc /scannow' and press Enter. This System File Checker scans all protected system files and replaces corrupted ones. It's like a doctor checking your system's vital signs—it finds and fixes underlying issues that might cause oplock problems.
- 3 After SFC completes, run 'DISM /Online /Cleanup-Image /RestoreHealth' and press Enter. DISM (Deployment Imaging Service and Management) repairs the Windows system image itself. Think of it as repairing the foundation of your house before fixing the walls. This can resolve deeper corruption that SFC can't.
- 4 If the error persists, check for network-related issues. Open File Explorer, right-click on the network drive you're using, and select 'Properties'. Go to the 'Caching' tab and uncheck 'Allow files on this drive to have contents cached'. This disables oplocks for that drive, which can resolve the conflict.
- 5 If you're using a specific application that triggers the error, try updating it to the latest version. Developers often fix oplock handling in updates. Visit the software vendor's website or use the app's built-in update checker.
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