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ufdbGuard is a URL filter
Besides blocking undesired websites, ufdbGuard also has features like
configuration of groups with different web access policies, SafeSearch enforcement, SSH tunnel detection, safer HTTPS traffic, time-based access rules and
can be used with various URL databases.
ufdbGuard blocks Tor, UltraSurf, SSH tunnels and VPN tunnels.
ufdbGuard works with the Squid web proxy
ufdbGuard is Open Source Software and can also be downloaded from
Do you know what an SSH tunnel is?
Everybody concerned with corporate security should know it and read this.