the user nails is created by McAfe virus Scan Engine
so i used the command
and reset the password for this user.
this solved the issue and i was able to login to McAfee virus Scan Console.
You need to set a new password for the account, nails.
By default no login shells will be configured, open the /etc/password file and check for nails account.
So login as root change the passsword by issueing passwd "nails"
this will set a new password for the nails account, using this you can monitor the logs and settings for virus scan on Linux machines.