On Friday evening, netBlazr had it's first major outage, unfortunately lasting six hours. In the end, the problem was with one of the fibers in Cogent's riser cable inside the John Hancock Tower. It was not a simple cut. That would have been obvious. Instead we had marginal light levels, perhaps due to a nick, a overly-tight bend or a poorly assembled connector.
For those that are interested, I wrote up my Friday evening adventures in summary form, followed with more detail for those who are really, really interested. Then this morning I wrote my followup list, again in the netBlazr blog for those who are really interested in the day-to-day issues of being an ISP.