The portal, just off O'Connell Street, is a large screen that shows New Yorkers what's happening on a street in Dublin, and Dubliners what's happening on a street in Manhattan.
Unfortunately when the portal was first activated, it immediately attracted a lot of anti-social behaviour - people swearing, people flashing body parts, and even someone showing a video of 9/11.
So now, instead of the portal being open 24/7 it's open only from 11 am to 9 pm in Dublin and from 6 am to 4 pm (EDT) in New York.
Jenny and I lingered for a while watching New Yorkers do their thing - mainly whooping and holding up slogans - and marvelling at this bit of high-tech.
Hopefully the shorter opening hours will reduce the misbehaviour. But with Dublin being known for its rowdiness, there are no guarantees.
The owners of the portal said they would install software updates "to limit such behaviour appearing on the live stream". Not sure how that would work but it sounds good.
But who needs the portal anyway? Who needs to see a random bunch of New Yorkers for five minutes? Or a random bunch of Dubliners? Isn't it just a rather pointless gimmick?