Jupyter 内部 API 未激活 - Vertex-AI jupyterlab 错误 524

Question

I cannot access Jupyterlab by web interface (error 524). It still works by ssh. I've followed the support documentations, but nothing works.

My best guess is that the main issue is with the opened ports of docker.
The key problem is probably below:

curl http://127.0.0.1:8080/api/kernelspecs
curl: (7) Failed to connect to 127.0.0.1 port 8080: Connection refused

And the following command simply restarts the service without error (but still inaccessible through web interface)

sudo service jupyter restart

Thanks!

EDIT: to clarify, all help from this article which specifically is supposed to fix error 524, doesn't work at all.
The diagnostic tool give this result, and the --repair doesn't work:

And "Verify that the Jupyter internal API is active" is completely useless as it doesn't explain how to fix the error!!

So I know there is a problem with the Jupyter internal API but no idea how to fix that.

EDIT 2: On the web console, here is a screenshot:

Answer 1

I have gone through the same error, after upgrading the VM problem got solved all the Jupyter API are healthy try upgrading the VM. Before that take a snapshot of disk(upgrading might erase your VM). How to upgrade the VM

Answer 2

As I mentioned in the comment a work around to resolve the issue can be by create a new instance keeping the old data.For this you can follow below steps:

Step 1: Create a new storage bucket and a new notebook.

Step 2: Copy the data to the newly created bucket by running the following command in the old notebook terminal.

 "gsutil cp -R /home/jupyter/* gs://NEW_STORAGE_BUCKET_PATH"

Step 3: From the new managed notebook's terminal, run the below command to copy the data to this new notebook.

"gsutil cp gs://NEW_STORAGE_BUCKET_PATH* /home/jupyter/"