Hi all, This is a problem that people have complained about before but I thought I'd start a new thread because this is about a particular cause. Essentially, the reason OSX Firewall repeatedly asks whether or not to allow/deny incoming connections with particular apps is that their signatures are invalid. Leopard/Snow Leopard is quite lenient with unsigned software but rather cracks down on invalid signatures. Now I have this problem with a lot of my apps and so I used Code: codesign -v /Applications/Coda.app For example and got back Code: a sealed resource is missing or invalid Now I think I've worked out why this is: XSlimmer. I use XSlimmer on almost all my applications because it's useful to slim down the apps but it means that the signature is no longer valid (I checked this hypothesis by testing a freshly downloaded Coda, running XSlimmer and trying again). It is really annoying to have to always click "allow" every time I use an application so I was wondering if anyone knows a way around this problem without a) disabling the Firewall b) not using XSlimmer.