The government has advised individuals who are unable to log into their eCitizen accounts to clear their browsing history and cache to resolve the problem.
"If you get the message below while trying to log into the eCitizen platform, please clear your Browsing History and Cache to get access to the platform," the government said in a statement.
It followed complaints by some users that they are experiencing challenges in accessing their accounts with a message indicating that they have been blocked.
"Sorry, you have been blocked. You are unable to access ecitizen.go.ke," the message reads.
"This system is using a security service to protect itself from online attack. The action you just performed triggered the security solution," the message on the eCitizen portal adds.
ICT Cabinet Secretary Eliud Owalo on Thursday last week confirmed that eCitizen portal had suffered an attack but no data had been lost.
He said the attack was by way of a group of hackers calling themselves Anonymous Sudan trying to jam the system by making more requests into it than ordinary, which led to the slowing down of the system.
"There was a cyber attack on the e-Citizen platform but no data was accessed or lost. We are addressing that, and we are not just coming up with instant remedial measures to address the current situation but are also ensuring that we build an elaborate risk mitigation framework,” Owalo said during a morning radio show.