Steam Subsystem | PreLogin - Authentication Failed!

I can’t connect to my dedicated Server(on VPS).

I followed these tutorials:

and I tried connecting to my server like this:

I don’t know where the problem is :confused:
I just want, that the server is working, so I can start developing my game.
ty, for any help.

Can really no one help me? :frowning:

I don’t know how to fix this, I can’t find the error message in the source code, I looked through every file with command promt for this line.

What do you guys need, so someone can help?

Help please?