"We're really sorry for any inconvenience and we'll let you know when we're back online."
The issue was resolved by 11.15pm, when a notice informing users the site was back online went up on Twitter.
As a result of the outage, the auction site extended listings due to close between 9.48pm and 11.15pm by two hours.
Those catching up on their latest favourite series on TVNZ On Demand took to Twitter to vent their frustrations when the outage was reported.
One woman wrote: "TVNZ is down one week after I discovered On Demand. How will I procrastinate tonight?"
Another was more than upset, writing: "I'm so f****** angry that the TVNZ On Demand app stopped working...I wanted to watch Big Brother."
RNZ said last night most of its users had reported receiving "Error 503" messages when they tried to access its website.
The 503 error message refers to an error response code indicating the server is not ready to handle a request.
The station's website homepage went offline about 9.46pm and access was restored just before 10.30pm.
The cause of the wide outage is not yet known.
A common cause, however, is a server that is down for maintenance or that is has become overloaded.