Federal Speaker Peter Slipper didn't have permission to enter the Federal Court in Sydney through the private car park, a court spokesman says.
Mr Slipper arrived at the Federal Court early on Wednesday morning to mediate in person with his former staffer, James Ashby, who has accused him of sexual harassment.
It is understood Mr Slipper arrived at the court in a government car and entered the building via the car park, avoiding the waiting media.
'Mr Slipper did not seek, nor obtain, permission from the court to access the building via the private secure car park,' a Federal Court spokesman said on Wednesday afternoon.
'The expectation is that all litigants enter and exit court buildings through public entrances.'
Mr Slipper came under stinging criticism from Justice Steven Rares on Tuesday after he failed to attend the interlocutory hearing.
'That is a completely outrageous piece of behaviour by someone who should know far better to not treat the court to this discourtesy,' Justice Rares said.
Justice Rares ordered Mr Slipper and Mr Ashby to engage in mediation in an attempt to resolve the bitter legal dispute.
A 'person of authority' from the commonwealth is also taking part in the mediation process, after it failed to finalise a settlement with Mr Ashby.
Last week, the federal government announced it had settled its case with Mr Ashby for $50,000 and a pledge to provide training for MPs and parliamentary staff to prevent sexual harassment, but the settlement hit some difficulties on Tuesday.
As well as the original sexual harassment case and the commonwealth settlement, the parties are also negotiating on Mr Slipper's application to throw out the case as an abuse of process.
The mediation process has entered its sixth hour.
If the parties fail to reach a settlement, the matter will return to the Federal Court on Thursday.