Most software doesn't try to connect to the Internet. Or even to the local network. If it does, the same thing happens when you update. At least, if you have Zone Alarm it does. For example, when I updated my e-mail program (Pegasus), Zone Alarm suddenly started blocking it, until I permitted it through again. Because it recognized that it had changed. Similarly, I had to go over to a friend's house to adjust her settings because she upgraded to a new version of WS_FTP, her firewall was blocking it, and she couldn't figure out how to let it through.