Go with SQL Server Driver Is Unable to Connect Successfully, Login Fail

Fix login failed for user.. error in connecting Microsoft SQL server in Python

Admittedly my python skills are not the best but I'm suspicious of all the single quotes in your connection string.

In the error message Login failed for user ' ' is that blank value for the use what you actually see or have you stripped that out? If that's what you actually see then I think your connection string is malformed.

Refer to the sample here for how to build out a connection string.

[Microsoft][ODBC SQL Server Driver][SQL Server]Login failed for user' error

If you set a UID and PW, then it's more than likely a SQL account. Does that account exist in SQL? When you remove UID AND PW, and replace with a trusted connection, it's then using windows authentication. If you do this, make sure your windows account has permissions in SQL.

SqlServer: Login failed for user

I ran into the same issue, and I fixed it by adding my windows username to SQL and then to my server, here is how I did:

First, create a new login with your Windows username:

Click Search, then type your name in the box and click check names.

Then add your that user to the server:

Right click on the Server > Permissions > Search > Browse > Select your user
(You will notice that now the user you created is available in the list)

I hope it helps ;-)

Java connection to a SQL Server Database: Login failed for user 'sa'

This database url is in wrong format

String DB_URL = "jdbc:sqlserver://localhost:1433;databaseName=Tema6;user=sa;password=123456";

instead of this try this

Connection connection = DriverManager
                .getConnection("jdbc:sqlserver://localhost:1433;\\SQLEXPRESS;databaseName=Tema6","sa","123456");

QT Connection Error [Microsoft][ODBC SQL Server Driver][SQL Server]Login failed for user ''.QODBC3: Unable to connect

A few things here.

First, you either use windows authentication, or you use SQL authentication. Not both.

If your connection string specifies Trusted_connection=yes, or integrated security=SSPI, then you're using windows authentication.

If your connection string specifies uid=someuser; pwd=somepassword then you're using SQL auth.

Pick one.

Now, if you're using an ODBC DSN, then the DSN already specifies the driver and server, so you don't need that in your application connection string. Instead, you just tell the application which DSN to use.

Let's say you created your DSN and called it "MySqlServer". Then your code will look like this:

db.setDatabaseName("MySqlServer");

Now, if the DSN is set up to use windows authentication, that's all you need to do. On the other hand, if it's set up to use SQL authentication, then you can take the credentials already specified in the DSN, or set a username and password in your code:

db.setUserName("myUserName");
db.setPassword("myPassword");

A connection was successfully established with the server, but then an error occurred during the pre-login handshake

Solution

1) Clean your VS.Net Solution

2) Rebuild Project.

3) Reset IIS

4) Run the project again.

Basically that solved my problem, but in my case i was not getting this error and suddenly my local environment starts giving me above error, so may be that trick work for me.

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