Home / Fixes

MCP Inspector keeps failing after a bad OAuth attempt

Error: Connection keeps failing after switching from OAuth to a token

What causes it

The Inspector caches the failed OAuth state and reuses it, even after you add a token header.

How to fix it

1. Click "Clear stored OAuth state" in the Inspector before switching to a token.
2. Then reconnect with the Authorization: Bearer header set.

Where we hit it

• GitHub MCP test report (tested Oct 16, 2026). Setup: Claude, Claude Code, Cursor, VS Code, ChatGPT

Related fixes

• MCP error: "Incompatible auth server: does not support dynamic client registration"
• GitHub MCP issue_write shows a form and creates nothing

All MCP fixes | Setup guides | Hit a different error? Request a test