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MCP: "Client Closed" / server disconnected right after start
MCP error: Client Closed (server process exited immediately)
- Affected versions
- recent
- Fixed in
- —
- Last verified
- Cursor (recent)
Root cause
The MCP server process starts then exits at once — usually a bad command/args, a missing dependency, or (on Windows) npm/npx not resolving so the process never really launches.
How to reproduce
Configure an MCP server, reload; it flashes connected then shows 'Client Closed'.
Solutions (2)
Ordered by community votes. Always check the verified version before applying.
33
#1Applies to recent
Run the exact MCP command manually in a terminal first — the real error (missing module, wrong path, bad args) shows there. Fix it, then update mcp.json.
Last verified: Cursor (recent) · community
24
#2Applies to recent
On Windows, wrap the command via cmd: `"command": "cmd", "args": ["/c", "npx", "-y", "<server>"]`, or use absolute paths to node/npx so the process resolves.
Last verified: Cursor (recent) · community