I was able to use my remote desktop with custom port when I was using Kaspersky Internet Security. Now, I have uninstalled my Kaspersky and switch to Avast!. Therefore, the windows firewall is turned on back again. However, after the firewall is turned on, I cannot connect to the remote desktop. I have set the remote desktop "checked" in the windows firewall as shown by here: http://windows.microsoft.com/en-my/windows7/use-remote-desktop-when-windows-firewall-is-on.
So, I am guessing it is caused by the custom port setting of my remote desktop. So, how can I unblock that on firewall to make my remote desktop works again?