Now after I played a lot with the Secure Client and also with the integrated SPI-Firewall in different test scenarios, here's one issue I stumbled over:
OS: Win XP SP1, latest Patches
ASC: v8.11
When configuring and using Modem-connections (COM-Ports) to connect with the Internet, I enable the SPI-FW (always) and also enable the "Allow Communication in the VPN-Tunnel only" to block all other traffic when the Tunnel is up. With this configuration it should no more possible to use other dataflow than the data that is going in and out the VPN-Tunnel.
Some tests showed: It is possible! Very unsafe.....
By choosing other connection media (i.e: LAN/WLAN) the above functionality is as expected - no other data traffic than to and from the VPN-Tunnel is possible.
Can anyone acknowledge this behaviour?
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