IT Pro is supported by its audience. When you purchase through links on our site, we may earn an affiliate commission. Learn more

Japan’s second biggest telco finally fixes network after three-day outage

KDDI’s disruption affected over 39 million users, with the government announcing it would set up an expert panel to investigate the matter

The Japanese telco KDDI has said that it has fixed a problem with its network which affected over 39 million users for over three days.

KDDI users were unable to access the internet or make voice calls in what is one of the country’s worst-ever network outages, as reported by the Japan Times. It also impacted service providers in sectors like banking, weather, logistics, and health care.

The operator experienced network failure on Saturday 2 July at around 1:35 am when it replaced a router for its core network as part of regular maintenance, which ended up preventing the connection of voice calls. The carrier attempted to fix the problem but experienced a heavy amount of traffic which exacerbated connection difficulties.

The company said on Monday that the network was almost restored and more or less stable, but it needed to keep monitoring it to ensure it had fully recovered. KDDI also said it would consider offering compensation to users.

"We deeply regret this as a telecommunications carrier in a position to support critical infrastructure and provide stable services," said Makoto Takahashi, KDDI president, according to Reuters. He said it was the biggest system failure in the carrier's history.

Around 70% of the network’s services had recovered by mid-morning on Sunday and KDDI planned to recover the rest by around 5:30 pm, said Takahashi. However, problems persisted until after this deadline, with the company only confirming that it had fixed the network today.

Earlier today, Japan’s communications minister, Yasushi Kaneko, criticised the company and said it had not fulfilled its responsibility as a telecommunications operator. Kaneko added that due to the unprecedented impact of the outage, the government will set up an expert panel to compile measures to prevent a recurrence.

"It is extremely regrettable that it has got to the point of potentially threatening people's lives and we are taking the situation seriously,” said Kaneko, referring to the disruption of emergency calls during the outage.

The Meteorological Agency has also demanded that the organisation come up with measures to prevent the incident from occurring again after some data distributions from its regional weather observation system were suspended. It has around 1,300 observation stations across the country, of which 550 had stopped transmitting data because of the network disruption.

Related Resource

Protect and preserve your data from endpoint to infrastructure

Achieve cyber resilience with help from a powerhouse partnership

Whitepaper cover with title and background circuit board imageFree Download

In the health sector, some medical facilities had difficulty in communication with doctors and drivers who were delivering pulse oximeters to coronavirus patients due to the disruption, revealed health minister Shigeyuki Goto. 

"To ensure there is no serious interference to medical and nursing-care services, we will work with prefectural governments to secure a stable system from normal times," said Goto.

Japan’s largest mobile telco, NTT, experienced a similar outage in October last year which lasted for around 29 hours and impacted 12.9 million users.

Featured Resources

The state of Salesforce: Future of business

Three articles that look forward into the changing state of Salesforce and the future of business

Free Download

The mighty struggle to migrate SAP to the cloud may be over

A simplified and unified approach to delivering Enterprise Transformation in the cloud

Free Download

The business value of the transformative mainframe

Modernising on the mainframe

Free Download

The Total Economic Impact™ Of IBM FlashSystem

Cost savings and business benefits enabled by FlashSystem

Free Download

Recommended

South Korean public sector organisations targeted by Gwisin ransomware
ransomware

South Korean public sector organisations targeted by Gwisin ransomware

8 Aug 2022
APAC region to lose 63 million jobs to automation by 2040
automation

APAC region to lose 63 million jobs to automation by 2040

8 Aug 2022
Cyber attacks rain on Taiwan during Pelosi visit
cyber warfare

Cyber attacks rain on Taiwan during Pelosi visit

5 Aug 2022
Microsoft becomes Australian space hub's first 'Constellation Partner'
Cloud

Microsoft becomes Australian space hub's first 'Constellation Partner'

4 Aug 2022

Most Popular

How to boot Windows 11 in Safe Mode
Microsoft Windows

How to boot Windows 11 in Safe Mode

29 Jul 2022
Cyber attack on software supplier causes "major outage" across the NHS
cyber attacks

Cyber attack on software supplier causes "major outage" across the NHS

8 Aug 2022
Should you take your password manager off the internet?
Sponsored

Should you take your password manager off the internet?

28 Jul 2022