Atelier and Eclipse not connecting to Server

Hi,

Interested in testing the Eclipse / Atelier on my Mac with 10.13.6 High Sierra, I installed both and had a go at connecting to my Cache Server. It offers Address & Port and login ID and Password.

No matter what I gave it, it cannot connect, saying Server not found.

The Server is a virtual Server running Windows 12 Server on a dedicated IP address, to which I can connect correctly using Remote Desktop, I can Ping  the IP so all looks good, except Eclipse cannot find it.

Any hints would be appreciated.

Thanks,

Rosti.