The Dublin portal has been closed and will reopen later this week after a solution of "blurring" to address lewd behaviour in front of the installation has been deemed as unsatisfactory.
The livestream art project allows people in Dublin and New York to connect via a live video feed.
The Dublin portal is located between O'Connell Street and North Earl Street in the city centre, while the New York portal is located on the Flatiron South Public Plaza at Broadway, Fifth Avenue, and 23rd Street.
However, inappropriate behaviour "by a small minority of people" led Dublin City Council (DCC) and the team behind the portal to find "technical solutions" to address it.
The preferred solution, which would have involved blurring any images held up to the camera, was not satisfactory, it said.
DCC said the team behind the portal, portals.org, was now investigating other "technical solutions".
As a result, the portal was switched off at 10pm and will be switched back on later this week.
Nicolas Klaus, head of partnerships at portals.org, said the team are adjusting the portal "on the go".
He told RTÉ's The Ray D'Arcy Show: "We are building in the open, so we are also adjusting on the go. It is live 24/7 and a very visible project, so at times we interfere, we make updates, we adjust, so this is part of the process."
When asked if they had technology that could block video images being shared between Dublin and New York, he said they are looking into different ideas but are optimistic they can "make some good implementations soon".
He said the purpose of the project was to open a window so people could freely meet across cultures and borders, but due to the volume of people, he believed there had been more than 50,000 visitors, various images had been shown to the camera.
"So, this is something that we would like to mitigate," he added.
Last night people gathered at Dublin's 'Portal' said the need for changes was embarrassing for Ireland.
Some remarked that while the behaviour in New York appeared civilised, there was much "clowning" and "whacky" behaviour in front of the Irish portal.
A number of young men were jumping up on the installation last night and holding their camera phones with pornographic images on them up to the lens.
Some people suggested that security or barriers needed to be put in place.
Reports in the New York Post newspaper said that viewers in the US had seen people in Dublin exposing body parts, making inappropriate gestures and holding up footage of 9/11 since the installation opened last week.
The 'portal' in New York is understood to have security, but the one in Dublin does not.
Dublin City Council is keen to emphasise that the majority of interactions at the 'portal' have been positive, with a successful marriage proposal among the highlights since it began operating six days ago.
Additional reporting: Samantha Libreri
