One of GridGuard's top supported device is the Juniper Networks Secure Access SSL VPN device. If you need a device to test GridGuard with as a proof of concept, Juniper Networks has release a free to download 2 user license Secure Access SSL VPN virtual machine. To download the virtual appliance image and documentation, follow the link below.
*NOTE: SyferLock Technology Corporation does not endorse this product. This article is just to inform a potential customer or customer about ways to test SyferLock's own security solutions. Any support outside of Juniper Networks Secure Access SSL VPN integration with GridGuard is supported by Juniper Network, not SyferLock Technology Corporation.