We purchased the Samsung 4G mobile hot spot last weekend and tried connecting to a VPN yesterday. I was able to connect for at least 1 1/2 hours before it started booting me off every 4 minutes 28 seconds. I found out our company uses PPTP as well as SSL for our VPN connections. According to the help page for the Samsung it is compatible with PPTP. Has anyone been able to get this to work on a VPN? The recent forum posts are not real positive. I'm also considering switching to the new 4510L hot spot. Anyone know if this one works any better?