Excerpts from internet.computing.firewalls: 30-Aug-96 Re: TN3270 and
TN5250 throu.. by "Paul D. Robertson"@clar
> > In both cases the connection attempt has failed with the client providing a
> > message it was unable to shift into transparent mode.
> >
> > Why would a proxy written for Port 23 not be able to accomodate all
forms of
> > telnet?
Another complication here is that the telnet protocol (and variants) are
technically not proxyable. First, the client needs to connect to the proxy,
then to the remote site. However, the telnet options it needs to negotiate
with the remote site may not be supported by the proxy, and not all proxies
deal well with this. If you can do a telnet options trace, try it, and you
may get much better debugging information.
Zachary Amsden
amsden @
andrew .
cmu .
edu
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