South Korean telecommunications vendor KT experienced a nationwide outage on Monday. Initially thought to be a distributed denial-of-service (DDoS) attack, it was later proclaimed that the issue was caused by a routing error. It caused a near 40-minute outage that prevented users from trading stocks, making purchases, and using other web-based apps. At this time, it is believed that almost all users have been able to access the internet again after KT’s crisis management team handled the issue. Federal police and the Ministry of Science and ICT said they were also looking into the matter in collaboration with KT. No other telecommunications services were believed to be affected, but SK Telco and LG Uplus received complaints from customers regarding small outages. It is possible these were simply from an influx of users switching over while KT was down.
Since it was discovered that a network outage caused the issues for KT and it was not a DDoS attack, companies who suffer network outages should:
• Determine the extent of the problem.
• Alert relevant stakeholders that there is an issue.
• Activate your disaster recovery plan.
• Restore functionality.
• Plan to prevent it from happening again.
More information may be released regarding this issue within the next few weeks.