Dublin Airport operator daa has said there is currently no timeline set for a fix to be implemented following a Europe-wide cyber attack last weekend which is impacting check-in and boarding systems at Terminal 2.
The issue arose early on Saturday and impacted major airports across Europe, including Heathrow, Brussels and Berlin.
In a statement this afternoon, daa said that operations were "moving well" at Dublin Airport today but that some airlines continue to deploy manual workarounds.
It added that there is still no timeline as yet for a fix to be implemented, and so check-in and bag drop at airline desks may take longer than usual.
The director of the National Cyber Security Centre has said authorities know the provider of the malware behind the cyber attack, but not the culprits behind the incident.
Speaking on RTÉ's News at One, Richard Browne said it would be difficult to pinpoint the location of the group behind the attack.
"We have all of the technical details from the incident, and we know, or we believe we know, who the actual group is. Precisely where they're based is always going to be interesting and difficult to try and work out," he said.
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"The other thing to keep in mind here is that we know the malware strain used. So this is the wholesaler or the reseller of the malware, we don't know who actually conducted the incident," Mr Browne said.
He added: "This will be an affiliate, basically a customer of the ransomware family and they will go out and actually conduct the incident. Who this group is, we don't know yet."
Mr Browne said despite efforts between public and private cyber security companies to combat this, cyber attacks against large organisations have increased in recent years.
"In the last couple of years, we'd started to see a slowdown and say in the pricing in the scale of instance, we weren't seeing as many very large incidents," Mr Browne said.
Passengers are being advised to contact their airline directly for the latest updates on their flight.
The disruption is the latest in a string of hacks targeting governments and companies across the world, hitting sectors from healthcare and defence to retail and autos.
A recent breach at luxury car manufacturer, Jaguar Land Rover, brought its production to a halt.
The problems were centred on MUSE software made by Collins Aerospace, which provides systems for several airlines at airports globally, airports said.
