I have compatibility issues with SmartSecurity and ZyWALL IPSec VPN Client. When trying to install the VPN client while SmartSecurity is installed I get a BSOD with the IRQ_LESS_OR_EQUAL error. This seems directly related to the “TheGreenBow NDIS Filter Driver” installed by the VPN client. I found a workaround for this by allowing installers full rights over Windows\System32\drivers\NDIS.sys before installing the VPN client. If I try to install SmartSecurity after the VPN client has been installed I also get a BSOD. After a reboot, SmartSecurity reports that protection is not running and that the firewall installation is corrupted. When using the first approach, there is another problem. Each time Windows is booted, I get an error that ESET SmartSecurity Miniport #[some numer] could not be installed correctly. However I have only observed this when using a 64 bit Windows installation. A more significant problem is that the VPN client is unable to connect properly when SmartSecurity is installed. I have opened the required ports and allowed the program internet connection when asked. However, the client only connects 1 of 10 times and only completes the first phase of the tunnel setup. It doesn’t help to disable the firewall completely, but as soon as I uninstall SmartSecurity, there is no problem connecting. I am using the latest version (220.127.116.11.03) of the VPN client as well as a fully updated SmartSecurity. Thank you in advance for any hints.