Is it broken, are you sure?
My apologies for asking, but now you can't say you've never thought about it.
Best Practice Analysis
Step one is to take a look at what you have going on and put an experienced eye on it. Next you do your best to assess weaknesses and develop corrective action plans.
Penetration (PEN) Testing
It's not an easy or pleasant game, but it is necessary.
We can perform these test either pre-emptively or on a periodic basis.
There is a lot we can do, but for that which we can't or are simply not permitted to, we can point you in the direction of someone who can.