Mirror is to have 12 concerts at the Hong Kong Coliseum in the coming months of July and August, where for the first time, tickets will be sold under a real-name system.

About 37,700 tickets were available for sale on Urban Ticketing System starting at 10am on Tuesday.

However, the page already showed "waiting for access" at 11am, soon becoming "server busy." As of 3pm, the site was still unable to respond.

As of noon, the website showed there were 31,146, or 82.4 percent of the tickets left.

The Home Affairs Bureau posted on Facebook earlier in the morning that Acting secretary Jack Chan Jick-chi and Director of Leisure & Cultural Services Liu Ming-kwong paid special attention to the first day of sales.

Chan said he was pleased to see that the ticketing operation was generally smooth and orderly, hoping the real-name system could reduce ticket scalping.

However, the post was slammed by citizens soon after. "How can he say it was smooth," a netizen left a comment. "We could not even enter the website, not to mention successfully buy tickets."

"I was still not able to reach the site till now. How could it be 'smooth,'" a netizen said, adding the post was "a lie."

"I didn't see anyone successfully accessing the page this morning," another added.