Checklists for software errors, setup, and tool workflows.

Fixing Nginx Upstream Connection Refused on Port 443

You see "upstream connection refused" in your Nginx error log when proxying requests to p...

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

fatal: Unable to create &#...

Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome Safe Mode

When you see NET::ERR_CERT_AUTHORITY_INVALID in Chrome while running in Safe Mod...

Git Push Large File Timeout Error: Fixes and Workarounds

You're trying to push a commit that includes a large file—maybe a dataset, a binary, or a gen...

Fix Windows Update Error 0x800f081f Installation Failed

When you see Windows Update error 0x800f081f with “installation failed,” it usua...

Fix Missing Taskbar Icons in Windows Notification Area

You look down at the notification area (system tray) and an icon you rely on—like volume, network...