Checklists for software errors, setup, and tool workflows.

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Fix Git 'index.lock file exists' Error

When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....

Fix 'Windows Cannot Access Shared Folder' in Workgroup
When you see 'Windows cannot access \\ComputerName\ShareName' in a workgroup, it usually ...

Fix Node.js Heap Out of Memory When Running Tests
When running test suites, you may encounter a fatal error like FATAL ERROR: Ineffective mar...

Docker Compose Environment Variable Not Set in Container: Fixes
You ran docker-compose up, but the environment variable you defined isn't availa...

Fix Cloudflare Origin Certificate with Let's Encrypt
If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...

Fix Firefox Secure Connection Failed on Windows 10
You're browsing in Firefox on Windows 10 and get a full-page error: Secure Connection Fai...

Checklists for software errors, setup, and tool workflows.

Latest checklists

Fix Git 'index.lock file exists' Error

Fix 'Windows Cannot Access Shared Folder' in Workgroup

Fix Node.js Heap Out of Memory When Running Tests

Docker Compose Environment Variable Not Set in Container: Fixes

Fix Cloudflare Origin Certificate with Let's Encrypt

Fix Firefox Secure Connection Failed on Windows 10

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