Thank you for answers, but currently I can't have the connection within my home network. I normally do use SSH over Wlan and I don't have any problems. But now my network is a hotspot shared by an Lumia 920, so I can't use PuTTY withing that as the Lumia won't support that to my understanding.

I will take time and read through the article rob_kouw provided, maybe there is something.

To my understanding Hemiwis advice can't help me in this situation.

Anyone with more "direct" advice?