A tie means that it's confused and buys you time. You should have 2 passes worth of actions to try. You could attack it and try to batter it down before it sets off an alert, or you could try to spoof a second time. I'll say that if you can find a security or admin level ID, they will give you +3 or +6 on your spoof tests in the system. You'll have to roll browse and score pretty big to get a good ID though. Naturally, that's something you could still do, after the IC is dealt with.
If you try a second spoof
6d6.hits(5) → [5,1,6,3,3,6] = (3)