http://www.worldcommunitygrid.org/help/viewTopic.do?shortName=start#106 points to http://www.worldcommunitygrid.org/bg/BOINCMassInstall.pdf . Inside that PDF is the following statement:

8 Firewalls and Proxies
There are two firewall rules that need to be allowed:
1. The binary boinc.exe needs to be allowed to communicate with ip address 129.33.89.133 on ports 80 and
443. This is communication to World Community Grid’s servers.
2. The binaries boinc.exe, boinc.scr, boincmgr.exe and boinccmd.exe need to be able to communicate to
127.0.0.1 on port 31416 (some firewalls restrict ip traffic to the localhost).


Is that information still correct?

The DNS addresses for www.worldcommunitygrid.org / grid.worldcommunitygrid.org suggest otherwise:

grid.worldcommunitygrid.org. 5782 IN A 198.20.8.241
www.worldcommunitygrid.org. 3304 IN A 198.20.8.246

And I think I remember hearing something about some CEP2 going directly to Harvard.