Forum Post: NAVDEMO Object Design Authotificaion and SQL Error

I have installed the SQL server 2012 and add the NAVdemo under the database of the SQL server. I have also assigned the user to administrator right to the NAVDEMO.

Then I installed the Demo of the NAV2013. After I open the Microsoft Development  

I can only use the window authentification to login, but not the SQL authentifiation.

If I select the SQL authentification, I have an error as below:

error 18456 2800 microsoft sql server native client 1000 sql server log failed

if SQL authentification is selected.

After I access the object design, I cannot do anything since it says I don't have the right.

Please help!

In the New NAV2013, is the object designer separate from the application? Thank you!