![mac noobproof firewall mac noobproof firewall](https://blink.ucsd.edu/_images/technology-tab/ICO-fire-mac-osx102-osx-port_pulldown.jpg)
Anyway, deleting the entry in LaunchDaemons for "net.waterroof", which is the expert mode sibling program for NoobProof that apprently gets installed with it, and rebooting fixed the VPN problem. The only symptom I have noticed for whatever ipfw rules were left by the incomplete uninstall of NoobProof is that the built-in Cisco VPN could not connect to servers. What I didn't know was that ipfw can be running and have rules configured for it even when System Preferences says that firewall is turned off. The MacOS firewall is a front end to ipfw. What I didn't know until now is that even though I deleted the app and turned off the firewall in System Preferences, it left behind something in system LaunchDaemons that creates some ipfw firewall rules at startup. That program provides an easy GUI front end for configuring the Mac OS firewall. Hi *that* Mike! I just accidentally fixed it! It turns out that the cause was an application I had installed on both of my Snow Leopard machines, called NoobProof.
![mac noobproof firewall mac noobproof firewall](https://blogdosuperapple.com.br/wp-content/uploads/2012/10/firewall-mac1.png)
Does anyone have some knowledge about this that could help, either about a setting that Sonic could change on the server or an alternative VPN client that can run on Snow Leopard? Thanks Sidney It may be that there is some option in the server that Sonic can tweak to re-enable use from Snow Leopard, but I don't know what to ask for. I haven't yet seen a clear explanation of what type of setting in a Cisco VPN server is no longer handled by the Snow Leopard VPN built-in client. Now, however, I do have a reason to use the VPN from a Snow Leopard machine. I have only casually tried to solve the problem as I have not had much need for the VPN on the two Snow Leopard machines (one 32 bit, one 64 bit) here and it continued to work fine on Lion and linux boxes and a Windows VM I tried it with. However with one of the updates to Snow Leopard, maybe the update to 10.6.4 or 10.6.5 but I can't be sure - It is up to 10.6.8 right now - the built in VPN stopped working with the two Cisco VPNs I was using it for, Sonic's and my university's. After an app is added, click its up and down arrows to allow or block connections through the firewall.
![mac noobproof firewall mac noobproof firewall](https://cdn.macpaw.com/uploads/images/630-enable-disable-firewall.png)
Click the Add button under the list of services, then select the services or apps you want to add. The recommended way to use the VPN is to use the Mac OS X built in support for Cisco VPNs. If the Firewall Options button is disabled, first click Turn On Firewall to turn on the firewall for your Mac. The Cisco VPN client does not support Mac OS X versions Snow Leopard and newer.