Custom MCP server works in Codex but fails DNS probe in ChatGPT Business

· Community Openai · Oct. 8, 2026, 9:54 a.m.
codex Network Configuration MCP Servers DNS resolution
Summary
This blog post discusses the differences in how a custom MCP server interacts with Codex versus ChatGPT Business, particularly focusing on issues related to DNS resolution when requests come from different network environments.
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