As the deputy is probably aware most Departments, including my own Department, now host their websites within the gov.ie domain which is managed by the Office of the Government Chief Information Officer (OGCIO). I have been informed by OGCIO that since gov.ie went live in 2019 there have been no occasions where the SSL certificates associated with my Department's websites have expired without renewal.
In the preceding years there is no record of any instances where certificates for my Department’s websites had expired.
The Department also has a website for Civil Defence, for which there is also no record of certificates having expired.
My Department and the OGCIO act immediately when alerted to upcoming expiry dates for its SSL certificates and renew them well in advance of the date.