Hello apttool!

avast! is not the reason you can not connect to your computer at work. avast! is on and running last 4 years on my machine, and I never had problems connecting through UlraVNC (WinVNC), pcAnywhere or any other remote connection tool to wherever I want… I am doing it right now with my dad’s computer all the way in Europe. avast! is not a firewall so it can no be the reason for your problem.

What is blocking your connection is your company’s firewall that doesn’t allow anything inside. You need to ask for pemission your administrator, or they need to do some additional configuring.