SVN checkout not working

the server runs on Linux, on our local network and has a svn 1.9.4-1 version
I have also created multiple new projects to test but all have the same problem.
Do I need to set up a user on the server? The only tutorials I saw were with a local repository and they more ore less ignored the username stuff.

I have also doublechecked the links, they start with http and I also tested them with https but no success either…