According to the ABS, throughout 9 August the census website received four denial-of-service attacks. At 7:30 pm, when the site was being heavily used, a software failure meant that the ABS was unable to keep blocking the denial-of-service attacks, leading to the failure of a router. As a result, the ABS decided to close down the system as a precaution. The ABS reported that no census data were compromised. The Australian Signals Directorate was assisting the ABS to bring the infrastructure back online more than 24 hours after the closure.