wrong port (-1) set when trying to run app from NWDS

Hello,

We are currently migrating our (namely) WDP development to NW 7.5.

We have so a new development box, so far so good even if we have some anoying bugs in NWDS 7.5.

But we have strange issue, when trying to run an WDP application from the studio, we got error "Windows can't find http://<server>:-1/webdynpro/resources/<myApp>"

So the port is not found, and also we see http where we should have https...

I guess something is wrong in NW box ?

From where is the url build ?

Thanks

Olivier