How to Fix Cloudflare Error 521: Web Server Is Down
Cloudflare error 521 means your origin web server is refusing the connection from Cloudflare'...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFixing Nginx Upstream Connection Refused and Permission Denied
If you see connect() failed (111: Connection refused) or connect() failed (13:...
How to Fix Missing Taskbar Icons in the System Tray
When you notice icons missing from the system tray (the area near the clock on the taskbar), it&#...
How to Uninstall a Windows Update in Safe Mode After a Blue Screen
If you're seeing a blue screen after installing a Windows update, the update itself may be th...
Windows Update Service Not Running: Registry Fix Guide
If Windows Update fails to run, the service may be disabled or corrupted. This guide covers regis...
Fix ERR_NAME_NOT_RESOLVED After Chrome Update
If Chrome started showing ERR_NAME_NOT_RESOLVED on every website right after an upda...
Issue queue
SitemapWindows 11 Update Failed Blue Screen Rollback Fix
Chrome Black Screen on Startup: Hardware Acceleration Fix
Git Clone SSL Connection Timeout: Causes and Fixes
Stop Nginx 302 Redirect Loop
Resolve Permission Denied Error in Windows Update Service
Troubleshooting Cloudflare 522 Behind Load Balancer
How to Fix Unhit Breakpoints in VSCode Debugging
Cloudflare Wildcard Subdomain CNAME Setup Guide
Fix 'Windows Cannot Access Shared Folder' Samba Error
Nginx Rewrite Rule Syntax Error Fix
Troubleshoot Firefox Certificate Errors in Windows 10
Understanding Git Detached vs Attached HEAD
Chrome Black Screen on Startup: Hardware Acceleration Fix
Git Clone SSL Connection Timeout: Causes and Fixes
Stop Nginx 302 Redirect Loop
Resolve Permission Denied Error in Windows Update Service
Troubleshooting Cloudflare 522 Behind Load Balancer
How to Fix Unhit Breakpoints in VSCode Debugging
Cloudflare Wildcard Subdomain CNAME Setup Guide
Fix 'Windows Cannot Access Shared Folder' Samba Error
Nginx Rewrite Rule Syntax Error Fix
Troubleshoot Firefox Certificate Errors in Windows 10
Understanding Git Detached vs Attached HEAD