Mizuho Bank's ATM = automatic teller machine became unavailable all over the country on the 28th, and the system failure on the 28th delayed the understanding of the seriousness of the damage, resulting in the spread of damage due to poor initial response. ..


This is the third time Mizuho Bank has suffered a major system failure, and the question is how to regain the trust that has been severely damaged again.

At Mizuho Bank, a large-scale system failure occurred on the 28th, and 4318 ATMs, which is 80% of ATMs nationwide, became unavailable at one point.



According to the bank, the cause of this failure was that the system was overloaded as a result of the simultaneous transfer of time deposit data and end-of-month transactions, totaling approximately 700,000 transactions.



The first error occurred around 9:50 am on the 28th, but the person in charge could not immediately grasp the seriousness of the situation.



In addition, at around 11:00 am on the 28th, even when customers contacted us that some transactions could not be made at ATMs or Internet banking, the bank decided that it would be possible to respond with normal business conditions. is.



Management recognized that there was a major system failure after noon on the day, and increased the number of call center personnel who received calls from each store around 2:00 pm, all branch managers and others. It wasn't until 2:30 pm that I instructed him to go to work.



As a result, there were a series of troubles in which bankbooks and cash cards could not be taken out of ATMs, and the number reached 5244 nationwide, and many customers were kept waiting at stores for a long time without any contact from the bank. I did.



The lack of assumptions on the part of the bank and the delay in the initial response led to the spread of damage.



At a press conference on the 1st, Mr. Fujiwara said, "It took time to recognize the spread of ATM obstacles. I should have requested all sales offices to go to work a little earlier." He showed the idea of ​​verifying while listening to the opinions of the three parties.



This is the third major system failure caused by Mizuho Bank, following April 2002 and March 2011, and the question is how to regain the trust that has been severely damaged again.