Quick answer
HTTP 524 is a Cloudflare timeout meaning the origin took too long to respond — with JupyterLab on GCP it usually appears during a long-running cell or a heavy proxy. Fix it by running long work in the background or in a script rather than a blocking cell, increasing the proxy/timeout limits, connecting over SSH port-forwarding instead of a proxied URL, or using a larger machine type.
Error 524 typically indicates that the server took too long to respond to the request. There can be a variety of reasons why this error might occur when running Jupyter Lab in Google Cloud Platform.
Here are a few things you can try to fix error 524:
Restart your Jupyter Lab instance. Sometimes, this error can occur due to a temporary issue that can be resolved by restarting the instance.
Check if there are any issues with the network connection. Make sure that your instance has a stable connection to the internet.
Check the resource utilization of your instance. If the CPU, memory, or disk usage is high, it can cause the server to take longer to respond to requests, resulting in Error 524. You can try reducing the workload on the instance by closing unnecessary programs or increasing the size of the instance to allocate more resources.
Check for any error messages in the logs. You can find the logs for your Jupyter Lab instance in the Google Cloud Platform Console. These logs may provide more information about the cause of the error and help you troubleshoot the issue.
If you have recently made any changes to the instance or installed any new packages, try reverting these changes to see if it resolves the error.
I hope these suggestions help!
Software Engineering Leader & Technical Author · Updated July 21, 2026