When you log in to vCenter Server from the vSphere Web Client login page, an error indicates that the account is locked.

After several failed attempts, you cannot log in to the vSphere Web Client using vCenter Single Sign-On. You see the message that your account is locked.

You exceeded the maximum number of failed login attempts.

If you log in as a user from the system domain (vsphere.local), ask your vCenter Single Sign-On administrator to unlock your account. As an alternative, you can wait until your account is unlocked, if the lock is set to expire in the password policy. vCenter Single Sign-On administrators can use CLI commands to unlock your account.

If you log in as a user from an Active Directory or LDAP domain, ask your Active Directory or LDAP administrator to unlock your account.