Re: what error is being reported back to sender, and how to avoid reporting back internal server ports?

[Wietse Venema]

> > No-one can connect to this from outside.
> 
> That's correct.  Not currently, to this current machine/port, in
> this configuration.

If someone can connect from outside to your 127.0.0.1 port, then
you have a serious infrastructure problem.

        Wietse