MS SQL Native Client Login failed for user when connecting via PHP

Question

I have a Windows 2008 R2 Datacenter server with IIS 7.5, MS SQL 2012 Express, using PHP 5.6 trying to connect to a database I created, testDB, via Windows Authentication, but am

Answer 1

Solution:

If you want to connect to SQL Server using Windows authentication, remove UID and PWD connection options. When you use these options, then PHP Driver tries to connect using SQL Server authentication (I guees that jaj is the value for UID).

<?php
$serverName = "nmc-intranet\intranetsql";
$connectionInfo = array(
    "Database"=>"testDB"
);
$conn = sqlsrv_connect($serverName, $connectionInfo);

if ($conn === false) {
    echo "Connection failed.<br />";
    die( print_r( sqlsrv_errors(), true));
} else {
    echo "Connection successful.<br />";
}
?>

Explanations:

The Microsoft Drivers for PHP for SQL Server can connect to SQL Server by using Windows Authentication or by using SQL Server Authentication. When you use Windows Authentication, then the Web server's process identity or thread identity (if the Web server is using impersonation) is used to connect to the server, not an end-user's identity. I use this script to get more information:

<?php
# ---------------------------------------
# SQL Server authentication
# ---------------------------------------
echo "SQL Server authentication"."</br>";
$server = 'server\instance,port';
$cinfo = array(
    "Database"=>'master',
    "UID"=>'login',
    "PWD"=>'password'
);
$conn = sqlsrv_connect($server, $cinfo);
if( $conn === false )
{
    echo "Error (sqlsrv_connect): ".print_r(sqlsrv_errors(), true);
    exit;
}
$sql = 
    "SELECT 'SUSER_SNAME' AS [NAME], CONVERT(nvarchar(128), SUSER_SNAME()) AS [VALUE]".
    "UNION ALL ".
    "SELECT 'SUSER_NAME' AS [NAME], CONVERT(nvarchar(128), SUSER_NAME()) AS [VALUE]".
    "UNION ALL ".
    "SELECT 'USER_NAME' AS [NAME], CONVERT(nvarchar(128), USER_NAME()) AS [VALUE]".
    "UNION ALL ".
    "SELECT 'USER_ID' AS [NAME], CONVERT(nvarchar(128), USER_ID()) AS [VALUE]";
$stmt = sqlsrv_query($conn, $sql);
if( $stmt === false ) {
    echo "Error (sqlsrv_query): ".print_r(sqlsrv_errors(), true);
    exit;
}
while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
    echo $row['NAME'].": ".$row['VALUE']."</br>";
}
sqlsrv_free_stmt($stmt);
sqlsrv_close($conn);


# ---------------------------------------
# Windows authentication
# ---------------------------------------
echo "Windows authentication"."</br>";
$server = 'server\instance,port';
$cinfo = array(
    "Database"=>'master'
);
$conn = sqlsrv_connect($server, $cinfo);
if( $conn === false )
{
    echo "Error (sqlsrv_connect): ".print_r(sqlsrv_errors(), true);
    exit;
}
$sql = 
    "SELECT 'SUSER_SNAME' AS [NAME], CONVERT(nvarchar(128), SUSER_SNAME()) AS [VALUE]".
    "UNION ALL ".
    "SELECT 'SUSER_NAME' AS [NAME], CONVERT(nvarchar(128), SUSER_NAME()) AS [VALUE]".
    "UNION ALL ".
    "SELECT 'USER_NAME' AS [NAME], CONVERT(nvarchar(128), USER_NAME()) AS [VALUE]".
    "UNION ALL ".
    "SELECT 'USER_ID' AS [NAME], CONVERT(nvarchar(128), USER_ID()) AS [VALUE]";
$stmt = sqlsrv_query($conn, $sql);
if( $stmt === false ) {
    echo "Error (sqlsrv_query): ".print_r(sqlsrv_errors(), true);
    exit;
}
while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
    echo $row['NAME'].": ".$row['VALUE']."</br>";
}
sqlsrv_free_stmt($stmt);
sqlsrv_close($conn);
?>