University of Helsinki

Since OpenSSH 7.3, it has been much easier to connect from the outside to Linux computers inside the UH network.
With older ssh versions, you needed to use a complicated "ProxyCommand", but now it is straightforward:
ssh -J username@markka.it.helsinki.fi username@workpc.pc.helsinki.fi
If you have the same username on both your work and home computers, you can skip the username.