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Tunnelling solutions commonly used outside the Tcl world include
SSH port forwarding,
Zebedee, 
Stunnel [http://www.idg.net/go.cgi?id=739518],
...

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See [SSL Tunnel] for a script that tunnels through web proxy servers using [tls].

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[SockSpy] can also be used for tunnelling. 
For example, I've used it to access my university's news feed machine 
from a remote site (the news feed machine would only accept local 
connections). [KPV]

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See also 
   * [tls]
   * [http]
   * [SSL Tunnel]
   * [Tunnel IRC through HTTP proxies]
   * [Tunnel HTTP through SMTP]

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[[ [Category Internet] ]]