Most of the 15 Government websites caught up in a four-day outage went back online yesterday afternoon.
A fault in the Ministry of Economic Development's Auckland IT systems knocked out a number of its services on Saturday night, including the Companies Office, Personal Property Securities Register and Intellectual Property Office websites.
The Companies Office website allows users to register companies and file annual returns, while the Personal Property Securities Register lets users check who has a legal interest in items such as a car or a house.
The Intellectual Property Office website allows users to apply for patents or trademarks.
Although it was operational, the MED said the Intellectual Property Office would stay closed until today to ensure no one would be disadvantaged in terms of filing dates and deadlines.