Description:
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I've tried using FreeTDS on Windows. With build 5.2.5, the php_mssql driver does not work. I haven't had a chance to investigate what changed in 5.2.5 to make this happen. 
I had an application running perfectly using PHP+MSSQL but upon upgrading to 5.2.5 all failed. When I down-graded, the application worked again.
Also, if anyone is wondering, yes, I am using the updated ntwlib, no the default one that comes with PHP. Also, if I use the microsoft SQL Driver ( http://www.microsoft.com/sql/technologies/php/default.mspx ) using 5.2.5, I can connect to SQL Server just fine, so this leads me to believe it's a problem with 5.2.5 in particular.
Also, I am not using the default port of 1433, but I have tried this connection using bot hthe default port of 1433 and the port I set to no avail. But the SQL Driver from MSFT will connect on either port, and when I downgrade it connects on either port fine.

Reproduce code:
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$server = "localhost";
$port = "5356";
$username = 'webapp';
$password = '**********';
$db = 'drupal5';
$con = mssql_connect("$server,$port", $username, $password);  

if($con) {
  print "<h2>We have a connection!</h2>";
}
else {
  print "<h1>NO CONNECTION TO |$server,$port| $username, $password! ERROR!</h2>";
}



Expected result:
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A screen that says: "We have a connection!"

Actual result:
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A screen that says: "NO CONNECTION" with connection information.