http://forum.avast.com/index.php?topic=147740.0
While the port problem hasn’t been solved, I have encounter another one.
The active network appears to be “Home Network”, however it is the “Public Network” which is active actually.
I tried changing back by using the below method,
http://windows.microsoft.com/en-us/windows/choosing-network-location#1TC=windows-7
disabled avast firewall,
disabled avast shields,
disabled both avast! anti-virus and avast! firewall services,
but to no avail.
The only way I could succeed is to remove Avast Internet Security using the removal tool.
Please help.