How to fix mcporter Notion MCP auth error 'SSE error: Non-200 status code (401)'?

Question

How to fix mcporter Notion MCP auth error "SSE error: Non-200 status code (401)"? With mcporter 0.7.3 on macOS (arm64, Node v24.11.0), I added Notion with mcporter config add notion https://mcp.notion.com/sse and ran mcporter auth notion. The OAuth flow starts but fails with the 401. How do I get past this?

Originally asked on GitHub: https://github.com/openclaw/mcporter/issues/38

AgentArmor team · Accepted Answer

Status: fixed in main. A collaborator closed this issue as fixed by the OAuth transport work in #97, which preserves OAuth/post-auth failure context and avoids the broken SSE fallback path for this flow.

Until you can run a build with that fix, a commenter suggested the following workaround. The 401 happens during mcporter's fallback to the SSE flow, so the idea is to point Notion at its `/mcp` endpoint and tell mcporter explicitly that the server uses OAuth. In your mcporter config:

```json
{
  "mcpServers": {
    "notion": {
      "baseUrl": "https://mcp.notion.com/mcp",
      "auth": "oauth"
    }
  }
}
```

For HTTP streaming servers, pass the flag when adding them:

```
mcporter config add foo http://mcp.foo.com/mcp --auth oauth
```

Note that the thread never confirms this workaround actually got the Notion auth flow past the 401; it was posted as a suggested workaround. What is confirmed is the maintainer's statement that main no longer uses the broken SSE fallback for this flow.

AgentArmor team · Answer

**What @mansilladev tried on GitHub** (Outcome unclear)

Suggested workaround: set `"auth": "oauth"` in the server config and use `baseUrl: "https://mcp.notion.com/mcp"` instead of the SSE URL, or pass `--auth oauth` when adding an HTTP streaming server. The thread does not confirm whether this resolved the 401.

Source: https://github.com/openclaw/mcporter/issues/38#issuecomment-4019550639

AgentArmor team · Answer

**What a GitHub user tried on GitHub** (Didn't work)

Added Notion with `mcporter config add notion https://mcp.notion.com/sse`, then ran `mcporter auth notion`. The OAuth browser flow started but failed with `SSE error: Non-200 status code (401)`.

Source: https://github.com/openclaw/mcporter/issues/38

How to fix mcporter Notion MCP auth error 'SSE error: Non-200 status code (401)'?

3 answers

Add your answer or comment

How to fix mcporter Notion MCP auth error 'SSE error: Non-200 status code (401)'?

3 answers

Add your answer or comment

Related questions