by the changes and claimed the decision was "totally at odds" with the objective to keep schools open, while the president of the garda representative association (gra) described the change as "a sucker punch" to their members, and that the decision "downgraded" the work of gardaí and disregarded the risks they took while policing the pandemic. on 7 april, the three teacher unions voted for an emergency motion backing industrial action, up to and including strike action, if they were not prioritised for vaccination. health service executive ransomware attack on 14 may 2021, the covid-19 vaccination registration portal was made offline after the health service executive (hse) shut down all of its it systems after a major ransomware attack, but was later restored in the evening. anti-vaccine protests a protest against covid-19 vaccination in dublin on 24 july 2021, around 1,500 protestors gathered in dublin city centre to protest against vaccines, new legislation allowing for the reopening of indoor dining and the eu digital covid certificate. on 27 november, thousands of people attended a protest against covid-19 restrictions and vaccine passports at the gpo on dublin's o'connell street.