# Logging on

To log onto the HPC systems, the steps vary depending on whether you are on the wired network on campus or offsite/using Eduroam. If you are off-campus, you must connect through the University's SSH gateway or use the University VPN. However, if you are on the campus network, no additional steps are required.

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Connecting via Eduroam or from the NHS network in St James's University Hospital is considered an off-campus connection.
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You can connect to Aire and Calder and log in using SSH (Secure Shell) from within the University network. Please see the following Knowledge Base articles for more information:

+ <a href="https://it.leeds.ac.uk/it?id=kb_article_view&sysparm_article=KB0018286" target="_blank">KB0018286 - How do I connect to HPC from Windows?</a>
+ <a href="https://it.leeds.ac.uk/it?id=kb_article_view&sysparm_article=KB0018284" target="_blank">KB0018284 - How do I log in to HPC on Linux or Mac OS?</a>

For more information on connecting to the University network via the VPN or SSH, please see the following articles:

+ <a href="https://it.leeds.ac.uk/it?id=kb_article_view&sysparm_article=KB0014674" target="_blank">KB0014674 - Securely Connecting to University Systems via the SSH Gateway</a>
+ <a href="https://it.leeds.ac.uk/it?id=kb_article_view&sysparm_article=KB0014410" target="_blank">KB0014410 - Connecting to the University VPN</a>

Note that all the above articles require you to log in with your University account to view.

:::{note}
For security reasons, Aire and Calder no longer support SSH key-based authentication for logins. Linux users who previously accessed Aire using SSH keys should update their configuration by removing any existing Aire entries from the `~/.ssh/known_hosts` file to prevent potential connection issues.
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