Not able to connect MCP server with OpenAI Connector

[mohankrishai08-alt]

Question

I created one MCP server in local, it is working correctly in VsCode copilot agent, but it is not able to connect in OpenAI connection python SDK, it is showing this error:

--------------------------------------------------------------------------
APIStatusError                            Traceback (most recent call last)
Cell In[8], [line 5](vscode-notebook-cell:?execution_count=8&line=5)
      1 from openai import OpenAI
      3 client = OpenAI()
----> [5](vscode-notebook-cell:?execution_count=8&line=5) resp = client.responses.create(
      6     model="gpt-4.1",
      7     tools=[
      8         {
      9                     "type": "mcp",
     10                     "server_label": "sqlserver-crm",
     11                     "server_url": "https://s9vl4sb0-8080.inc1.devtunnels.ms/sse",
     12                     "require_approval": "never",
     13                 },
     14     ],
     15     input="capital of france",
     16 )

File c:\Users\Mohankrishnan\AppData\Local\Programs\Python\Python310\lib\site-packages\openai\resources\responses\responses.py:828, in Responses.create(self, background, conversation, include, input, instructions, max_output_tokens, max_tool_calls, metadata, model, parallel_tool_calls, previous_response_id, prompt, prompt_cache_key, reasoning, safety_identifier, service_tier, store, stream, stream_options, temperature, text, tool_choice, tools, top_logprobs, top_p, truncation, user, extra_headers, extra_query, extra_body, timeout)
    791 def create(
    792     self,
    793     *,
   (...)
    826     timeout: float | httpx.Timeout | None | NotGiven = NOT_GIVEN,
    827 ) -> Response | Stream[ResponseStreamEvent]:
...
-> [1047](file:///C:/Users/Mohankrishnan/AppData/Local/Programs/Python/Python310/lib/site-packages/openai/_base_client.py:1047)         raise self._make_status_error_from_response(err.response) from None
   1049     break
   1051 assert response is not None, "could not resolve response (should never happen)"

APIStatusError: Error code: 424 - {'error': {'message': "Error retrieving tool list from MCP server: 'sqlserver-crm'. Http status code: 424 (Failed Dependency)", 'type': 'external_connector_error', 'param': 'tools', 'code': 'http_error'}}
Output is truncated. View as a [scrollable element](command:cellOutput.enableScrolling?abc04bd9-c029-4734-8d94-30376b5cb585) or open in a [text editor](command:workbench.action.openLargeOutput?abc04bd9-c029-4734-8d94-30376b5cb585). Adjust cell output [settings](command:workbench.action.openSettings?%5B%22%40tag%3AnotebookOutputLayout%22%5D)...

I added Port forwarding, but this is not able to get the response!! how to fix thhis?

Additional Context

No response

[felixweinberger]

Have you tried whether the MCP server works in Claude Desktop or any other clients besides VSCode?

If it works in VSCode it suggests something may not be working with the OpenAI() SDK in which case you'd need to raise an issue there rather on the MCP SDK here.

[maxisbey]

This seems like it may be an issue with how you've set up Microsoft dev tunnels. Have you confirmed that the dev tunnel is woking? I'd recommend trying to test your dev tunnel setup with something more simple like a basic web server then trying to see if you're able to access it.

Additionally, are you seeing any logs server side, such as a client attempting to connect but failing? Otherwise if you're not seeing any logs from your server then it's most likely an issue with your dev tunnel setup which would be outside the scope of the MCP Python SDK.

[mohankrishai08-alt]

The dev tunnels is working! but it is not able to connect with OpenAI in the response API, I don't see any logs also.
It is showing 424 error.

[maxisbey]

If you're not seeing any logs server side then I think your best bet is to find help around dev tunnels or OpenAI, which is outside the scope of this repo unfortunately.

Otherwise, if you or someone else is able to confirm the issue is definitely with the Python SDK specifically then it would make sense to investigate.

Maybe try and confirm the issue by using other SDKs such as the Typescript SDK? If it happens with the Typescript SDK too then the issue is likely with your dev tunnels or OpenAI setup and not our SDKs. If the issue only happens with the Python SDK and not the Typescript SDK then I'd say that confirms the issue here.

[mohankrishai08-alt]

Does the OpenAI can take my MCP server in localhost? my doubt is this?

[maxisbey]

You'll need to reach out to the OpenAI or Microsoft Dev Tunnel support channels for help. This is out of scope for this repo.

For now I'm going to close this issue. If you get proof that the Python SDK has a bug causing this, rather than your dev tunnel/openai setup, then feel free to open a new issue with that evidence.