Trouble Connecting to sql server Login failed. “The login is from an untrusted domain and cannot be used with Windows authentication”

Question

I am trying to host a SQL server database, but whenever I try to connect to it I get this error:

The login is from an untrusted domain and cannot be u

Answer 1

Following worked for me to get access from another machine to SQL Server using Windows Authentication. This approach may be useful only in development/test environment. E.g. you need to update password manually once you change it on your working machine.

On machine with SQL Server go to Control Panel and add new Windows User with same username and password as is on your working machine. Then create SQL Server login for this user:

CREATE LOGIN [SQLSERVERHOST\myuser] FROM WINDOWS;

Now you can use this login for Windows Authentication.

If you receive error 'The login is from an untrusted domain', this may mean that you changed password on your working machine and now need to update password on SQL Server machine.

Answer 2

If you have two servers on the same domain (eg. APP and DB), you can also use Windows Authentication between the app and MSSQL by setting up local users on both machines that match (same username and password). If you don't have the passwords matched up, it can throw this error.

Answer 3

Following was working for me. hope this helps you

<add name="getconn" connectionString="Data Source=servername;Initial Catalog=DBName;Persist Security Info=True;User ID=sa;Password=***" />

Answer 4

Yet another thing to check:

We had our nightly QA restore job stop working all of a sudden after another developer remoted into the QA server and tried to start the restore job during the middle of the day, which subsequently failed with the "untrusted domain" message. Somehow the server pointed to be the job's maintenance plan was (changed?) using the ip address, instead of the local machine's name. Upon replacing with the machine name the issue was resolved.

Answer 5

As mentioned here, you might need to disable the loopback

Loopback check can be removed by adding a registry entry as follows:

• Edit the registry using regedit. (Start –> Run > Regedit )
• Navigate to: HKLM\System\CurrentControlSet\Control\LSA
• Add a DWORD value called “DisableLoopbackCheck” Set this value to 1

Answer 6

If your SQL Server is on one domain controller and you are trying to connect to it from another domain controller then you will get this error when

IntegratedSecurity = true;

This will happen even if you include a valid SQL Server username and password in your connection string as they will automatically be over-written with your windows login and password. Integrated security means simply - use your windows credentials for login verification to SQL Server. So, if you are logged in to a different domain controller then it will fail. In the case where you are on two different domain controllers then you have no choice but to use

IntegratedSecurity = false;

Now, when Integrated security is false SQL Server will use the SQL Server login and password provided in your connection string. For this to work, the SQL Server instance has to have its authentication mode configured to mixed mode, being, SQL Server and Windows Authentication mode.

To verify or change this setting in SQL Server you can open the SQL Server Management Studio and right-click on your server name and then select Properties. On the pop-up that appears select Security and you will see where to alter this setting if you need to.