# X_MCP_REMOTE_REFUSED

## Means

a remote MCP server failed or refused the call

## Typical cause

the url is wrong, the server answered a non-2xx other than 401 (a 401 is `X_MCP_REMOTE_AUTH_REQUIRED`) or a JSON-RPC error, or it spoke no protocol era this client knows

## Fix

`curl -sS -X POST <url> -H 'content-type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' — then correct mcpTools({ url, auth })`

[MCP and AI](/error-codes#mcp-and-ai)