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Current sessions should zero out after there are no longer any connection in the connection table. Resetting the statistics won't reset the connections, just the stats related to those connections. To zero out your connections you would need to either disable the pool members and wait for the last persistence profile to expire, or force them offline and wait for the last active connection to finish. Lets say they are short lived HTTP connections. If you forced all the pool members offline, withing a few minutes you should see your current sessions start to drain. On the other hand, if you had a long lived connection with long lived persistence and you simply disabled them, you may never see your sessions drain fully.