It is a problem with the firewall
If you uninstall only the firewall of avast 2014 it will work, but then you have just the windows firewall
I did this on my systems and it runs. I do not know which port/protocol is blocked.
For the moment I have no time for further investigations.
Update: I have three computers. Only one of them has this problem. The 32-bit systems (Vista&Win7) doesn't show this problem.
Only the Win7 64bit computer has this problem, but sometoimes it runs too
?