The most recent update of Avast! seems to fix this problem (at least with Avast!).
Windows 7 Version 6.1.7601, Java 7u45
Redirected here from MC-43077. Getting this issue too. Currently using Avast! Premier. Only way I can get the server to run is to disable the firewall.
The most recent update of Avast! seems to fix this problem (at least with Avast!).