The operating system must enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period.

By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.

Verify that the operating system enforces the limit of three consecutive invalid logon attempts by a user during a 15-minute time period. If it does not, this is a finding.

Configure the operating system to enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period.