No connection could be made because the target machine actively refused it

Yeap, ok.
But the issue here is that I am using a post request trough an WCF app.
This will work fine on my home PC call(web form - web app) - from the work PC call.
It will not work from the WCF service I use that uses LOCAL IIS 7 or my work PC (that an app I created works fine through my local PC).

So I tried various IIS manipulations, made it iis express, made it visual studio IIS, made it local IIS, made it https, http, nada.
When debugging the code and it goes to the getrequest - from site line, it will break.

What is going on here? Is it the IIS? The wcf works flawlessly on about 20.000 lines of code but the post call to another vendor will break.