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Windows: MCP-launched child processes cannot connect to localhost TCP services

OS: Windows 10 (10.0.26100) Codex: gpt-5-codex (config-based MCP) Node.js: v22.17.0 Target: any localhost TCP service on 127.0.0.1:PORT Any MCP server that must communicate with a local TCP service ...
GitHub

Codex cannot cURL localhost APIs

• Ran curl localhost:8081 └ % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 0 curl: (7) Failed to ...