According to the National Cyber Security Center, Japanese government offices and companies are experiencing large-scale connection failures such as being unable to display their homepages.
The cause is a failure of the network service of the American IT company "Akamai".
Temporarily unavailable for viewing such as JR East and JAL
In addition, according to the people concerned, the homepages of multiple companies such as JR East, Japan Airlines, and Tokyo Metro were temporarily unavailable before dawn on the 23rd.
It means that something has gone wrong with the system.
The police and others are investigating the detailed situation.