This actually looks like a bug in iOS7
rather than our software. Apps have relatively little control over
what is actually happening when you are in settings - basically
none really.
It appears if you enter text in one field, then change to another
input field then the previous fields changes do not get saved.
Might have something to do with bringing up the different keyboard
layouts between the standard URL keyboard and numeric keyboard for
the port setting.
Might also have something to do with the input field not being
visible after losing focus. Really not sure - but as this is not
programmed by us, I'm quite certain its an iOS7 bug.