I have got a user in my database that hasn\'t got an associated login. It seems to have been created without login.
Whenever I attempt to connect to the database with t
Create a login for the user
Drop and re-create the user, WITH the login you created.
There are other topics discussing how to replicate the permissions of your user. I recommend that you take the opportunity to define those permissions in a Role and call sp_addrolemember to add the user to the Role.