Washington (CNN)The dramatic expansion of teleworking by US schools, businesses and government agencies in response to the coronavirus is raising fresh questions about the capacity and security of the tools many Americans use to connect to vital workplace systems and data. At one major US agency, some officials have resorted to holding meetings on iPhone group calls because the regular conference bridges haven’t always been working, according to one federal employee. But the workaround has its limits: The group calls support only five participants at a time, the employee noted. “Things have worked better than I anticipated, but there are lots of hiccups still,” said the employee, who spoke on condition of anonymity because he is not authorized to speak on the record.Meanwhile, as of last week the Air Force’s virtual private networking software could only support 72,000 people at once, according to a federal contractor who was also not authorized to speak on the record, and telework briefing materials viewed by CNN. The Air Force employs over 145,000 in-house civilian workers, and over 130,000 full-time contractors.Change in routines can create new opportunities for hackersAs they increasingly log on from home, Americans are having to meld their personal technology with

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