Programming Tutorials

  There are few things more disruptive to a developer’s flow state than an AI assistant that suddenly goes silent. You are in the middle of a complex refactor, you prompt GitHub Copilot Chat, and instead of a solution, you get a loading spinner that spins indefinitely. Eventually, the Output logs reveal the culprit: a 400 or 401 error, specifically the  Invalid Authorization Header . This guide targets professional developers and enterprise users experiencing persistent Copilot authentication failures. We will move beyond basic troubleshooting to diagnose the root cause of token desynchronization and implement a permanent fix within your VS Code environment. The Root Cause: Token Desynchronization To fix the issue, you must understand the architecture of the failure. GitHub Copilot relies on a secure handshake between your local VS Code client and GitHub’s API endpoints (typically via  api.github.com ). When you sign in, VS Code acquires an OAuth2 access token. This token...

  Few things break a developer's flow state faster than a spinning loading icon where code suggestions should be. If you are working in an enterprise environment, behind a corporate firewall, or using a VPN, you have likely encountered the frustrating "GitHub Copilot could not connect to server" error. This isn't just a connectivity glitch; it is almost always a Trust Level Security (TLS) or proxy configuration conflict between the Node.js runtime powering VS Code and your network's security infrastructure. This guide provides a rigorous technical breakdown of why this happens and offers three distinct solutions, ranging from quick configuration overrides to root-level certificate fixes. The Root Cause: TLS Handshakes and Corporate Proxies To fix the problem, you must understand the architecture of the failure. GitHub Copilot operates as a VS Code extension, which runs inside a Node.js process. When Copilot requests suggestions, it initiates an HTTPS request to  h...