IBM has said it plans to compensate the Australian government for a "malicious" cyber-attack that shut down a national census.
But the company blamed two domestic internet providers for the security lapse.
IBM was the lead contractor for the five-yearly August 9 household survey by the Australian Bureau of Statistics (ABS).
The survey went offline that day after four distributed denial of service (DDoS) attacks, caused by the website being flooded with clicks.
The breach embarrassed a government which has sought to impress voters with its cybersecurity credentials and plans to trial online elections.
The census is already controversial because of privacy concerns.
"I am confident we'll be able to achieve some kind of outcome in the very near future," IBM Australia and New Zealand managing director Kerry Purcell told a Senate inquiry into the matter, without discussing terms of the negotiations.
He added that IBM was helping a police investigation but declined to say who he suspected was behind the attack.
He said that the attacks were launched through a router in Singapore and blamed Australian ISP Vocus Communications, a subcontractor of Nextgen Networks, for failing to shut it down.
"We had repeated assurances from the ISP that the appropriate protocol was in place," Purcell said.
In a written submission to the inquiry, IBM said its preferred anti-DDoS measure, which it calls "Island Australia", involves "geoblocking", or getting the company's ISPs to shut down offshore traffic coming into the country.
In a written submission to the inquiry, Nextgen said IBM told it about "Island Australia" six days before the census website went live in July, and that IBM declared a test of the strategy four days before the census a success.
It said Nextgen followed IBM's instructions, but noted that IBM rejected Nextgen's offer of additional anti-DDoS detection measures.
Vocus said in a submission that it told Nextgen the week before the census that it "did not provide geoblocking" and that "Vocus was in fact requested to disable its DDoS protection product covering the e-Census IP space".
It did not specify who gave that instruction.
ABS chief statistician David Kalisch said he was confident IBM could deliver on its $10m contract based on "the comments and exhortations that IBM had made to the ABS about the importance of this work" beforehand.