Overview

The Web portals are a great way to interact with the supercomputers, however they can sometimes have issues caused by a client browser, or supercomputer account issue.

Session Went From Queued to Completed

If a session went straight from “Queued” to “Completed” and never launched, it is likely an issue with your supercomputer account. Here are some common issues:

Conda in bashrc

Open a shell on the supercomputer and check your ~/.bashrc file. If this file has any lines pertaining to conda or mamba, you will need to remove them or comment them out. Conda initiation functions conflict with the binaries the web portal needs to start sessions. It is preferred to use a module to load a Python package manager so as to not conflict with the web portal

Pip Used Outside of a Mamba Environment

If you used pip to install a python package outside of a mamba environment or used pip with the --user option, pip likely put files in ~/.local/lib/python*. Certain Python packages or their dependencies conflict with the web portal, and will cause problems. If you can verify that none of the files in ~/.local/lib/python* are needed, You can remove these with the command: rm -rf /.local/lib/python*

Otherwise, reach out Research Computing staff for assistance.

Home Directory Full

If your 100GiB home directory is running out of space, web portal sessions may encounter start-up issues. In this case, you will have to access a shell on the supercomputer and remove any unused files, or transfer them to scratch. The ncdu command can assist in identifying the specific files and directories consuming space.

Proxy Error

If you encounter a proxy error while accessing the web portal (often when opening a Jupyter or R session), you can resolve this by clearing your browser's cookies and cache, switching to a different web browser, or using an incognito/private browsing window.

The shortcut for this is Ctrl + Shift + Delete on Windows or Command + Shift + Delete on a Mac

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Sessions Disapearing

If you are having trouble with the interactive sessions disappearing after trying to launch a new session, please ensure that any ad blockers or privacy filters have been disabled for the web portal URLs.

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Additional Help