Cisco announced a scheduled maintenance for their NetAcad portal :
Beginning Saturday March 18, Networking Academy exam delivery will be unavailable. Chapter exams, Packet Tracer Skills Assessment (PTSA) and final exams will be impacted. Please plan your learning activities to avoid the time listed below for your location. We apologize for the inconvenience.
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San Francisco: March 18 1:00 pm PDT to March 19 5:00 am PDT (UTC-8)
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New York: March 18 4:00 pm EDT to March 19 8:00 am EDT (UTC-5)
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London: March 18 8:00 pm GMT to March 19 12 noon GMT (UTC)
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Hong Kong: March 19 4:00 am HKT. to 8:00 pm HKT (UTC+8)
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Sydney: March 19 7:00 am AEDT to 11:00 pm AEDT (UTC +11)