I think I was trying to connect to port 4000 before, which obviously didn’t work.
Now, if I put in my public IP and the right port, I get the message: “Could not connect to the server. Error is 22: Invalid argument”
Based on the documentation (https://www.nomachine.com/TR12R09992), it has to do with a config setting, but I can’t seem to find the relating entry. The only line I find that is called like that is “ClientMenuConfiguration all”, but it’s commented out.
When trying to switch to SSH as suggested, it tells me that SSH is not supported by the server (most likely due to the free version?).
I also found a note stating that the username must not contain capital letters. That is not the case here, the user I am trying to connect to is written with no capital letters.