Ok, maybe they passages would have been closed up, thats very likely, greencapt's explanation satisfied me, but at the time it was attacked DSII was more vunerable than DSI, everyone that has 'defended' the corridors has basically said this. Because it was still under construction it was more vunerable, because it was more vunerable the Empire had a shield on it.
The dual death star thing doesnt bother me, it was more of the fact that it didnt seem the Empire learned anything and protected it any better that bother(s/ed) me about it. So it had a shield on a base that didnt really seem to take much to destroy, once that was gone it was totally defensless save the Fleet surrounding it. Did they do anything to the DS itself to prevent an attack from small fighters? (save the temporary shield that was inplace during construction) it didnt appear so.
Put both Death Stars out in the middle of space with nothing to protect them, or maybe jut themselves to protect them. as they were when they were destroyed, the 2nd one would be easier to destroy as if your willing to sacrafice yourself you can destroy it with no missles, the first takes a very skilled pilot to fire a very precise shot into a very small hole.
The empire was just sloppy on the Death Star II's construction...like Luke told the Emperor "You're overconfidence is your weakness" and guess what, it was oh so true.
-Darth Simon