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Asked: 2026-06-06T01:12:13+00:00

I am attempting to connect to a Microsoft SQL server db using PHP (in

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I am attempting to connect to a Microsoft SQL server db using PHP (in IIS). The user/pass provided in the code is an AD account that can access the database via ODBC in Access just fine.

$serverName = "servername";
$connectionInfo = array( "Database"=>"dbname", "UID"=>"myuser", "PWD"=>"mypass");
$conn = sqlsrv_connect( $serverName, $connectionInfo);

if( $conn ) {
     echo "Connection established.<br />";
}else{
     echo "Connection could not be established.<br /><pre>";
     die( print_r( sqlsrv_errors(), true));
}

The username and password are valid, as are the server name and database name. But this is returning the error:

[Microsoft][SQL Server Native Client 10.0][SQL Server]Login failed for user ‘myuser’.

For the username (which is a valid user in AD, and I can connect/link to this database using Access) I’ve also tried:

My domain user (myuser) has admin privileges to that server via AD. But that returns the same Login failed error. Is there something I’m missing? I can connect to this same db using Access without a problem (under the same user).

The way I connect in Access is an ODBC Data Source for the local user. The Data Source is set to authenticate “With Windows NT authentication using the network login ID”. How can I do that in PHP?

Is this impersonation configuration the possible cause?

PHP is running under the user nt authority\iusr

If it was trying to login using iusr wouldn’t the error message say so?

I’ve tried creating a Data Source on this machine called “TestDS” and using the code:

$conn = odbc_connect("TestDS", "", "");

But that gives me:

The specified DSN contains an architecture mismatch between the Driver and Application, SQL state IM014 in SQLConnect

Machine1 is a client trying to access a webpage (where the PHP code is on Machine2) and the code on Machine2 is making the SQL connection to Machine3 (servername).

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1 Answer

  1. Editorial Team

    “Windows Security” in SQL Server connections is enabled by specifying “Trusted Connection=SSPI” in the connection string. No username or password is stored in the connection string (that’s only for “SQL Server Security”). The process running PHP (presumably php_cgi.exe itself) must run under a Windows (either local or AD) that has a Windows login registered on the SQL Server.

    Under IIS php_cgi.exe runs under the user identity of the application pool. If you have a heterogenous security environment I suggest creating an IIS application pool just for this single website.

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