All IT systems at NUIG have been taken offline following an attempted cyber attack earlier today.
All web traffic in and out of the University has also been blocked while a team of cyber security experts assess the situation.
The impact of the shutdown means that students hoping to access lectures or other course materials online have been locked out.
Experts are currently assessing whether any data breaches have occurred as a result of the incident.
University authorities have indicated that at this stage it does not appear that the hackers were able to compromise any data.
Students and staff were informed just before 9am on Thursday that there was a ‘disruption to connectivity’.
Cloud-based applications such as email and Zoom are unaffected and remain available to access from off campus.
It is not known at this stage when services will be restored — with some raising the possibility that assignment deadlines may have to be changed should the outage drag on.
Last year a security firm paid a hacker after NUIG data was accessed during a cyber attack.