AI client connection failed due to strict MCP version rejection

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A major AI client could not connect to an MCP server on September 24, 2026, because the server rejected requests with unsupported version headers. The server initially enforced the MCP specification's requirement to respond with HTTP 400 for unsupported versions. The AI service provider first fixed the issue by adding the observed version to its supported list. They then implemented a second fix, making the server accept a range of older version dates while still rejecting newer, unsupported ones.

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