I had deleted a system user "sysuser" from the server. I had previously used this user to login to SQL Server through "Windows Authentication" mode.
Now, I tried to create a new user with the same username and password but am unable to login to the SQL Server again.
I deleted the user in the server from control panel. Then I log in to SQL Server using windows authentication but cannot log in. I tried to add back the user with same password using control panel. I tried to log in SQL Server using windows authentication and the re-created user but still cannot log in.