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I cannot change anything, any attempt to connect through Miktex results in this connection error.

This error has not been resolved.
No connection could be made because the target machine actively refused it.
Any attempt to download installers other than "Basic MiKTeX" is met with the above error. Any attempt to change "Package Repository" results in the same error. However basic installation ...

Thank you for helping me out with this specific problem and with my MiKTeX system. I updated MiKTeX to version 2.9 and all works well.

L. Gawarecki

I try to compile the following file.
\documentclass{article}
\usepackage{mnsymbol}

\def\ci{\perp\!\!\!\perp} % from Wikipedia
\newcommand{\independent}{\protect\mathpalette{\protect\independenT}{\perp}} % symbols-a4, p.106
\def\independenT#1#2{\mathrel{\rlap{$#1#2$}\mkern2mu{#1#2}}}

\begin ...