Problems with observing a repository

Hello dear Phabricator community,

I am new to Phabricator and so on, but my development team prefers this application, so I spent some time with it to set it up and all that stuff.
Currently I have the problem that I can’t observe a private svn repository.
I set the credential I use with Tortoise SVN and the same URL to import it, but Diffusion says this:

Now it says it was unable to connect to the repository but I am not sure if I got the mistake right.
Does it not connect cause of a unsecure connection, does it?

As I said I am new to Phabricator and this stuff, so please consider this writing an answer ^^