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Use this page for transport failure diagnosis. For benchmarks and transport selection guidance, see /platform/transports.

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Common WebSocket failure modes

  • Upgrade rejected (426): client did not request WebSocket upgrade headers.
  • Auth rejected (401): missing/invalid token query parameter.
  • Frequent disconnects: client not handling reconnect + backoff.
  • Silent tool failures: session established, but client is not forwarding JSON-RPC IDs consistently.

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Recovery checklist

  1. Confirm URL uses wss://mcp.undisk.app/ws?token=....
  2. Retry with Streamable HTTP endpoint https://mcp.undisk.app/v1/mcp to isolate transport issues.
  3. Add reconnect jitter and idempotent request handling in the client.
  4. Capture request IDs and compare behavior across HTTP vs WS paths.