Always......
It's getting difficult to accomplish anything on it outside of work. Gets worse for us when we take off on Gov Sponsored vacations.
They are always working on something new, and it never really hurts to call if you can manage. They sometimes don't know that a segment of the boxes in a stack of servers isn't behaving as it should until someone calls.
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http://teamrwb.com/
"Let the blood of the infantry flow through your veins,or the blood of the infantry will be on your hands."
- GEN John A. Wickham, Jr. speaking on the responsibilities of MI soldiers.