Skip to content

OpenML API returning 504 Gateway Timeout errors #404

Description

@sam-heta

Hello,

I am having issues accessing the OpenML API. The main OpenML website (https://www.openml.org/) is working normally, but API requests consistently return a 504 Gateway Time-out error.

Although the website itself loads correctly, I am unable to download any datasets. Dataset downloads fail with the same 504 Gateway Time-out error from nginx.

I tested this using both the OpenML Python package and direct HTTP requests and the issue occurs across different environments.

Because the API requests are timing out, the OpenML Python package is unable to retrieve tasks or datasets.

Could you please check if there is an issue with the API backend?

Thank you.

Activity

  1. SubhadityaMukherjee commented on Jul 28, 2026

    @SubhadityaMukherjee
    Contributor

    Hello, you should be able to access things now. :) @sam-heta
    More information will be posted once it is available.

  2. cecimerelo commented on Aug 16, 2026

    @cecimerelo

    Ecperiencing the same issue, do we know what's going on ? or if there are any alternatives?

  3. PGijsbers commented on Sep 16, 2026

    @PGijsbers
    Contributor

    First of all, thanks both for sharing your experiences and sorry for the slow reply. We have had some intermittent outages over the last months, and are working on resolving the underlying issues which kept us busy. In the mean time, we have already successfully gradually lowered the downtime of the website and API to the point where any outages that do occur have been limited to a few minutes at best.

    Since this is an issue with server infrastructure and not with the website itself (which is what this issue tracker is for), and since it is also largely mitigated by now, I am going to close this issue. Should you experience similar issues in the future please reach out on our Slack server or create an issue in REST API or openml-python repository, depending on which API you used to connect to the server. That way it will reach the right people faster, thanks!

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions