No, I am able to connect to the sql server
with those users.
I have one user who has sysadmin role. I do login to the sqlserver using that user.
I am trying to lock/Unlock other sqlserver users by using sp_grantlogin and sp_denylogin
EXEC sp_denylogin 'work'
but i am getting the following error
'Work' is not a Valid Window NT name. Give the complete name: <domain\username>. Here 'work' is one of the users with sql server authentication.