Fix the "Not found" error on the Astra MCP sign-in page

Last updated: November 2, 2026

This article explains how to fix the Astra MCP sign-in page when it shows only {"error":"Not found"} after clicking Allow in VS Code.

Symptom

  • After clicking Allow in VS Code, the browser opens a page on mcp-auth.getastra.com/api/auth/error and shows only {"error":"Not found"}.

Browser showing {"error":"Not found"} on the mcp-auth.getastra.com error page

  • In VS Code, the server log (MCP: List Servers > astra > Show Output) shows Error getting token from server metadata: Error: Failed to create authentication token followed by Error 401 status sending message to https://mcp.getastra.com/mcp.

VS Code Output panel showing the 401 error

VS Code Output panel showing the 401 error

Why it happens

VS Code keeps the sign-in details from an earlier Astra MCP connection. When those saved details are no longer valid, the sign-in request is rejected and the browser lands on the error page. The Astra account and password are not the problem.

How to fix it

  1. Open the Command Palette with Cmd+Shift+P on macOS, or Ctrl+Shift+P on Windows and Linux.

  2. Type and select Authentication: Remove Dynamic Authentication Providers.

Command Palette showing Authentication: Remove Dynamic Authentication Providers

  1. In Select a dynamic authentication provider to remove, select Astra MCP and click OK.

Astra MCP selected in the dynamic authentication provider list, with 1 Selected and OK

Astra MCP selected in the dynamic authentication provider list, with 1 Selected and OK

  1. Confirm with Remove when VS Code asks Are you sure you want to remove the dynamic authentication provider "Astra MCP"?

Confirmation dialog with Cancel and Remove buttons

Confirmation dialog with Cancel and Remove buttons

  1. Open MCP: List Servers, select astra and choose Start Server, or click Restart above the server entry in the configuration file.

  2. Click Allow when VS Code asks to authenticate, and complete the sign-in in the browser as described in Sign in and allow access in Connect Astra MCP to your AI tool.

The sign-in page now loads normally and the server shows Running.

If the server still does not connect, see Fix Astra MCP connection errors.

For anything not covered here, contact help@getastra.com.