Software troubleshooting desk

Practical fixes for tool errors, setup blocks, and workflow issues.

Symptom

Cause

Fix route

Verify

Fresh repair notes

All notes

Fix DNS Probe Finished NXDOMAIN on Custom DNS Server

If you see “DNS PROBE FINISHED NXDOMAIN” in Chrome or another browser while using a custom DNS se...

Fix Windows Security App Blocked by Antivirus

You open Windows Security (formerly Windows Defender) only to see an error or blank screen becaus...

Fix Git Push Rejected: Non-Fast-Forward Error

You try to push a commit to a remote repository and get: ! [rejected] main -> main (non-...

Fix Windows 11 Installation Assistant Stuck at 99% with Clean Boot
You're upgrading to Windows 11, and the Installation Assistant gets stuck at 99% for a long t...

Fix Chrome Crash on Startup Due to Corrupt User Profile
If Chrome crashes immediately when you open it, or shows a warning that your profile may be corru...

Fix Cloudflare 521 Error on Nginx: Step-by-Step Guide
If you see a Cloudflare 521 error, it means your origin server (the Nginx server behind Cloudflar...


    Issue queue
Sitemap
Chrome Access Violation Error – Startup Fixes
Fix 'Permission Denied' When Activating Python venv
Fix Windows Update Error 0x80070002 on Windows 11
Troubleshooting Nginx 502 Errors in Docker Logs
Antivirus Interfering with Windows Security
How to Fix Windows 11 Upgrade Stuck at 99%
Chrome Extensions Grayed Out: Fixes That Work
How to Resolve ERR_NAME_NOT_RESOLVED in Chrome on Mac
Windows Security App Not Working After Reset? Try These Fixes
Troubleshooting Nginx 403 Permission Denied
How to Resolve Windows Update Error 0x80070002
How to Set Up a Wildcard Subdomain DNS Record in Cloudflare
Desk note

    Troubleshooting paths
Home
Windows FixesmacOS HelpBrowser IssuesOffice ToolsDeveloper ToolsCloud SoftwareSecurity ToolsBackup RecoveryNetwork ToolsDatabase ToolsAI ToolsProductivity AppsCLI ErrorsDocker KubernetesEmail ClientsFile Utilities