I already called my provider and they told me everything it's ok from their side. I can totally trust it, since this problem exist only with m&b: with any other game (as well as downloading from internet) i don't have any problems and my internet is fast as usual.
I tried to uninstall hamachi, and that leaved me around 20 ping (i don't have idea why), but i've still more than 70.
Later i will try to see how to allow this door and if it will work, since i've no idea how to do and have not much time actually.
Thank you