Hi,

keeping it short: The anchor href for one example script seems to be outdated:

In Section 1.4 Forwarding Incoming Connections

>> Use the basic script below or see an "advanced" version, which can handle several different machines and port mappings here

'here' points to:

However this seems to have moved to  

Please check if this is correct and update the broken link, if it is feasible.

BR,

Thomas