The issue began around 5:30 p.m. Saturday.
Technicians identified the cause as an equipment failure at a data center managed for the commonwealth by Unisys and said technicians immediately began to work on plans for recovery.
"We are working around the clock with our vendors to bring services back online as quickly as possible and will continue to do so until operations are fully restored," said Secretary of Administration Michael Newsome Sunday evening.
Newsome said that during the outage the affected agencies activated their continuity plans and provided additional information to customers of the impacted services.
Officials said there is no indication at this time of any malicious physical or cyber activity, or that any loss of data has occurred.