The minister responsible for the botched online census appears to have been subject to hacking on his own website.

Michael McCormack spent Wednesday morning defending the Government's handling of the census rollout, after the site was shut down following a series of "denial of service" cyber attacks on Tuesday night.

An errant link labelled "gay sex" was spotted on Mr McCormack's official website on Wednesday afternoon.

It hyperlinked to what appeared to be a Polish finance company's website.

Michael McCormack's website earlier on Wednesday afternoon. ( Michael McCormack MP )

Shortly after the ABC contacted his office about the link, Mr McCormack's website was listed as "down for maintenance".

Michael McCormack's website after ABC News contacted his office. ( Michael McCormack MP )

Today he defended the census website being shut down while thousands of Australians attempted to log in and said it was not an attack or hack.

"A denial of service is an attempt to block people from accessing a website," he said.

"No census data was compromised and no data was lost."

The ABC has contacted Mr McCormack's office for comment.