Tickets for 16 of the scheduled 20 shows for One Direction's 2013 Australian tour have already sold out within hours of becoming available.
The British boy band announced their return next year on April 18, on the eve of their departure from Australia after their recent tour.
One Direction - comprising Louis Tomlinson, Harry Styles, Niall Horan, Zayn Malik and Liam Payne - will perform at concerts in Sydney, Melbourne, Brisbane, Adelaide and Perth from September 11 to October 13, 2013.
When Ticketek announced extra Sydney and Melbourne shows for their second tour on Tuesday, fans took to the site and to Twitter with some saying they'd had success and others saying the site had frozen.
More desperate fans appealed to people not buying tickets to get off the website.
Tickets went on sale again on Saturday from 10am (AEST), and in the first hour of online sales punters once more had trouble accessing the site to purchase tickets.
'You are currently queued and will be automatically redirected to ticketek.com.au as customers ahead of you have left the website. Do not refresh this page,' says the Ticketek site, only to then be advised 'Server is busy'.
Ticketek, who could not be contacted because their phone number was continuously engaged, limited ticket sales to a maximum four per person.
Pandemonium hit fever pitch on April 10 when the group landed in Sydney to the delight of screaming fans for their first-ever live shows in Sydney, Melbourne and Brisbane, which started on April 13.
Bandmember Styles recently told BBC Radio of his warm feelings for Sydney.
'My favourite places were New York and Sydney - I'd never been to Australia or New Zealand before, so that was sick.'
Their album, Up All Night, sold four times platinum in Australia.
Drawn from the UK's version of The X factor, One Direction made history as the first British group to debut at number one in the US with their first album.
Limited tickets are still available for Melbourne and Sydney shows in October 2013. Perth shows will go on sale in late May or early June.
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