"Well done" Adobe -- forgot to turn on firewall
In this security notice Adobe explain they forget to turn back firewall on, if they had to turn it off during installation of the CS3 package.
On Mac OS X, customers can turn on a personal firewall to control how Internet services communicate with their systems. During the installation of Adobe Creative Suite 3, the installer sets TCP ports 3703, 3704, 50900, and 50901, in accordance with Apple’s specification, to allow controlled access to Adobe Version Cue CS3 Server through the Mac OS X firewall service. To be granted access to these ports, the installer must first turn off the personal firewall. Currently, it is not automatically re-activating the firewall once it sets up Version Cue CS3 Server, creating a potential security vulnerability.