[BUG] MCP Fails to connect

Resolved 💬 4 comments Opened Jun 11, 2025 by sameehj Closed Jun 19, 2025

Environment

  • Platform:
  • [ ] Other: Claude CLI
  • Claude CLI version: 1.0.17 (Claude Code)
  • Operating System: 14.3.1 (23D60)
  • Terminal: Cursor Terminal

Bug Description

I try to add the mcp server [0] which is mainly running [1] for mcp

claude mcp add -t sse ebpf http://localhost:8080/mcp

Steps to Reproduce

  1. clone ebpf-mcp & run make
  2. run ebpf-mcp-server (can be ran locally / on vm)
  3. attach to claude mcp using the command above
  4. run claude --debug

[0] https://github.com/sameehj/ebpf-mcp
[1] https://github.com/mark3labs/mcp-go

Expected Behavior

MCP connected successfully

Actual Behavior

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[DEBUG] MCP server "ebpf": SSE Connection error: {"url":"http://localhost:8080/mcp","error":"SSE error: Non-200 status code (202)","stack":"Error: SSE error: Non-200 status code (202)\n    at _eventSource.onerror (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:13931)\n    at wm.ro (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:4946)\n    at file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:1799\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)"}
[ERROR] MCP server "ebpf" Error: SSE error: Non-200 status code (202)

Additional Context

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