GSS module for proftpd News
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The new release mod_gss 1.0.2 has two new options AllowCCC and AllowFWCCC.
Together with the yafc client from http://sourceforge.net/projects/yafc/ and the provided yafc patch a statful firewall like Checkpoint should still be able to firewall the secure ftp traffic. This is possible because the PORT/PASV command information will not be protected to allow the firewall inspection of the required port information.