Which character you playing? The remote?
In that case you dont need to open the door, all 4 republic ships are in the 2 areas you can explore.
If your playing the exile then door only closes for the encounter with the boss beast then reopens. If it remains closed then yes its a bug (not one I ever ran into tho).
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If it's a bug, that would suck. So close to finishing and it's gone.
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DAMMIT IT IS A BUG!!!! You Gotta be kidding me. The frekin door closed before the damn beast got through it! Im going to melt this game down and pour it in someones anus... any takers? Oh well guess Il'll just taser my self to sleep.