From ZoneLabs FAQ
3. What is lockup.zonelabs.com?
Your dialer may indicate a destination address of lockup.zonelabs.com. This is a landing page with instructions for people who have experienced firewall hardening. Firewall hardening is a failsafe security measure built in to our products. If a hacker or malware attempts to directly assault ZoneAlarm, Plus, or Pro, the software prevents Internet access for any applications not already running. When this happens, the user's browser automatically displays lockup.zonelabs.com. Firewall hardening is rarely triggered, but when it is, it's important for you to know what has happened.