MSSQL server error connecting

Hi! I'm used to work with HeidiSQL but always to a MySQL server. Now while connecting to MSSQL get the same error: The remote server denies connection as this snapshoot shows. I'll apreciate any kind of help!!!

You could try the other library/provider then.

It addresses me to some URL for downloading the first one. So I'll return to the first problem

Well what happens if you just press the OK button? Does it connect, or what?

Nothing, i get and error again. I've already checked firewall(actually I disabled it for testing purpose) There's an app nevertheless wich could connect fine so MSSQL services are working fine.