I use Retrospect Pro. Yesterday the client on my iBook kindly warned
me that there'd been no backup for a week.
Everything seemed fine, but the server software (on Windows)
definitely couldn't see the Mac client.
Then I dimly remembered enabling OS X Personal Firewall (Sharing
preferences) prior to connecting via an open 802.11b hot spot. Sure
enough, turning off personal firewall restored Retrospect
functionality. Obvious in retrospect.
Posted here for two reasons:
1. To warn other Retrospect users. Non-experts won't think about their
Retrospect client when they decide to enable the firewall
2. To point out how darned ...