Help Center/ ModelArts/ Troubleshooting/ DevEnviron/ Instance Faults/ Failed to Access a Notebook Instance
Updated on 2025-08-22 GMT+08:00

Failed to Access a Notebook Instance

If you cannot open your notebook instance, troubleshoot the issue based on error code.

A Black Screen Is Displayed When a Notebook Instance Is Opened

A black screen is displayed after a notebook instance is opened, which is caused by a proxy issue. Change the proxy to rectify the fault.

A Blank Page Is Displayed When a Notebook Instance Is Opened

  • If a blank page is displayed after a notebook instance is opened, clear the browser cache and open the notebook instance again.
  • Check whether the ad filtering component is installed for the browser. If yes, disable the component.

Error 404

If this error is reported when an IAM user creates an instance, the IAM user does not have the permission to access the OBS bucket.

Solution

  1. Log in to the OBS console using the tenant account and grant access permissions for the OBS bucket to the IAM user. For details, see Granting an IAM User the Specified Permissions for a Bucket.
  2. Log in to the ModelArts console as the IAM user, delete the instance, and create a notebook instance using the OBS path.

Error 503

This error is reported probably because the instance is consuming too many resources. In this case, stop the instance and restart it.

Error 504

If this error is reported, submit a service ticket or contact the customer service.

Error 500

Notebook JupyterLab cannot be opened, and error 500 is reported. The possible cause is that the disk space in the work directory is used up. In this case, identify the fault cause and clear the disk by referring to Disk Space Used Up.

Error "This site can't be reached"

If you click Open in the Operation column of your notebook instance, but error message "This site can't be reached" is displayed, do as follows:

Copy the domain name of the page, add it to the Do not use proxy server for addresses beginning with text box on the Windows proxy setup page, and save the settings.