The websites of Finland's defence and foreign affairs ministries were out of service on Friday, the ministries announced in separate tweets at just before 1pm.
The defence ministry said its website was taken down by a denial of service (DoS) attack and that it was investigating the matter.
The defence ministry's communications chief, Kristian Vakkuri, confirmed that a DoS attack was the cause of problems with its services.
"We are investigating the matter as best we can and will provide more information when we know more," Vakkuri told Yle, but did not speculate on who could be behind the attack.
"There are disturbances in the web services of the Ministry for Foreign Affairs at the moment. We are investigating the matter and trying to make the services work as quickly as possible. We apologise for the inconvenience," the foreign ministry tweeted.
The DoS attacks occurred just as Ukrainian President Volodymyr Zelensky addressed the Finnish Parliament.
A denial of service attack is carried out by flooding a targeted website with excessive traffic or sending it information that triggers it to crash.
Nordea Bank online disruptions
Nordea Bank has also reported disruptions to its online services affecting customer savings accounts.
"There may be issues with some savings accounts at this time," the bank stated on its website, adding that it was trying to resolve the issue as soon as possible.
The bank later confirmed that the issue in question was not a cyber attack.
However, the bank was the target of a DoS attack at the beginning of last month.