Originally posted by: InlineFive
If you can't come up with an old computer to run Linux on I would seriously look at Kerio first. Zone Alarm is "fat" and causes too many problems.
Recent dialog with client, who was setting up a new PC and wanted an L2TP VPN connection to his SBS 2003/ISA 2004 Server:
Me: "Your Certificate looks fine. I duplicated your VPN setup on my own laptop, and my laptop is working fine. The error messages look like a firewall problem on your PC."
Client: "I don't think that's it. I've told ZoneAlarm to allow the VPN connection."
Me: "Let's turn OFF ZoneAlarm."
Client: (Reluctantly) "OK, it's off."
Me: "It's working now."
This is a VERY knowledgeable client, who has been running his own Windows Server and Exchange Server for years. I spent a couple of hours on two separate Sundays, exchanging email with him and re-generating Security Certificates. He probably spent MANY more hours on this problem. More likely, he spent DAYS.