@Federico Trifoglio​ :

There have been some recent reports of issues with accessing the Ray dashboard, particularly with the 502 Bad Gateway error. This could be due to a number of reasons, such as server overload, network issues, or bugs in the Ray software.

One thing you can try is to check if there are any known issues with the version of Ray you are using, and if there are, try upgrading to a newer version that might have addressed the issue.

Another thing you can try is to check the logs for any errors or warnings related to the Ray dashboard, and see if there are any clues as to what might be causing the issue.

You could also try reaching out to the Ray community for help, as they might have more information or suggestions for how to troubleshoot the issue.