[K12OSN] Blocking http tunnel and ssh tunnel

Robert Arkiletian robark at gmail.com
Wed Jun 8 22:18:47 UTC 2005

On 6/8/05, M.Pribik <mpribik at zoznam.sk> wrote:
> Is it possible to block "http tunnel" and "ssh tunnel" created by students
> on Windows desktop PCs? The Internet traffic of the Window desktops are
> going through K12LTSP server and HTTP traffic is filtered by Dansguardian.
> The tunnels can override the filter! 
>  Thank you, Marian 

Try changing the default port of ssh from 22 to something above 3000.
Just edit  /etc/ssh/sshd_config and make sure it's not readable by
users. I think by default it should be 600.

Robert Arkiletian
C++ GUI tutorial http://fltk.org/links.php?V19

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