Fix Windows Security Token Expired Error 0x80070520
You see error 0x80070520 with the message 'The security token has expired.' This usually happens ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Update Error 0x80070002
When you see error 0x80070002 while running Windows Update, it usually means the update files are...
Fix Command Prompt Update Not Working
If you've tried to update Windows or a specific program via Command Prompt and the update won't r...
Fix 'Port Already in Use' Error with Windows Defender Firewall
You try to start a local service or application, and it fails with an error like 'port already in...
Windows Security App Missing in Windows 11: How to Restore It
If you open Start and type 'Windows Security' but nothing appears, or you get an error when tryin...
Fix Windows Security Migration Not Working After Update
After a Windows update, you might find that Windows Security (formerly Windows Defender) fails to...
Topic paths
Quick titles
Microsoft Teams Audio Setup GuideTroubleshooting Certbot Certificate Renewal ErrorsFix 'Java JDK Not Recognized' in Android StudioTask Scheduler Remote Computer Timeout: Quick FixesFix Windows Search Indexer High CPU and Memory UsageFix Permission Denied When Updating Windows DefenderTroubleshoot Windows Search Indexing Stuck or PausedHow to Fix Windows Defender Error 0x80070002 and High Memory