What caused the immediate surge on the SafeTravel website yesterday?

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A surge of nearly 35,000 users caused the SafeTravel website disruption on November 22.

A significant influx of close to 35,000 users attempting to access the SafeTravel website to apply for the vaccinated travel pass led to a system disruption lasting several hours on November 22. The issue arose shortly after the application portal opened for travellers from Malaysia and Indonesia at 10am that day. Although the system had been scaled up over the preceding weekend in anticipation of high demand, an error in its configuration contributed to the outage.
High User Volume Overwhelmed System Capacity

The SafeTravel website experienced a substantial surge in user activity when its application portal for the vaccinated travel pass became accessible to travellers from Malaysia and Indonesia. This immediate demand saw nearly 35,000 users attempting to log in simultaneously, overwhelming the system's capacity. The portal was specifically opened for these two countries at 10am on November 22, triggering the intense user traffic.
Configuration Error Contributed to Disruption

Despite efforts to prepare the system for anticipated demand, including scaling up capacity over the weekend, an error in the configuration was identified as a contributing factor to the disruption. This suggests that while the infrastructure was enhanced, a technical misstep in the setup prevented it from handling the peak load effectively. The Immigration and Checkpoints Authority (ICA) acknowledged this error in their statement.
System Resumed Normal Operations by Mid-Afternoon

Following the disruption, the SafeTravel website and its application portal eventually resumed normal operations by 3pm on November 22. The Immigration and Checkpoints Authority (ICA) stated that the system was back online and functioning as expected after the hours-long outage. The authority also conveyed its regret for any inconvenience caused to applicants during this period.

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What caused the immediate surge on the SafeTravel website yesterday?

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