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Most of the desktop machine at the STRW can be accessed through the ssh protocol. So when you know your machine name, use that (including the strw.leidenuniv.nl domain) to access that machine directly.
If you do not have a personal machine you can use the
ssh.strw.leidenuniv.nl virtual machine to log into our systems and continue from there with an ssh to any of the science servers or cluster machines.
For Instituut Lorentz, the server is ssh.lorentz.leidenuniv.nl. Desktops and servers cannot be reached directly from outside, so you will always have to go through the ssh server first.
For LION, there is ssh3.physics.leidenuniv.nl.