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Debugging MCP Server Connection Issues: 7 Common Errors and Fixes

This story is from 2026-08-25. It is preserved in the archive; the latest stories are on the live feed.

"MCP server failed to connect" is the most common complaint in the MCP ecosystem. The error message is almost always useless — a generic failure with no hint about what actually went wrong. Here are the seven real causes, in order of frequency, and how to fix each one. 1. Stdio pollution (the #1 ki…

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  1. 2026-08-25 21:11 · DEV Community — AI
    Debugging MCP Server Connection Issues: 7 Common Errors and Fixes

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