strange behaviour of header(Location: ...)

[clemont]

hi,

My login-form submits the username and password to the following php-file:

include("session_mysql.php");
session_start();

$link = mysql_connect("mysql.sourceforge.net", "bla", "blabla") or die(mysql_error());
mysql_select_db("bla") or die(mysql_error());

$name = $_POST['name'];
$passwd = $_POST['kennwort'];

$query = "SELECT * FROM user WHERE name = '".$name."'";
$result = mysql_query($query) or die(mysql_error());
$row = mysql_fetch_array($result, MYSQL_ASSOC);

if(mysql_num_rows($result) <= 0) {
	$redirect = "Location: http://bla.sourceforge.net/foo/login.php?msg=".urlencode("user not available");
}
elseif($row['passwort'] != $passwd) {
	$redirect = "Location: http://bla.sourceforge.net/foo/login.php?msg=".urlencode("wrong password");
}
else {
	$_SESSION['user'] = $name;
	$_SESSION['perm'] = "true";
	$redirect = "Location: http://bla.sourceforge.net/foo/game.php?mod=market";
}

mysql_free_result($result);
mysql_close($link);

session_write_close();

header($redirect);
header("Status: 303");
exit;

But testing this hack gives me just no output. I submit my login-form and I the login-form is loaded again, nothing else happens.
If i do echo $redirect; it's just nice, the string is always right.
Where's the reason for this problem?

[onion2k]

Interesting.. I've got a similar but intermitant problem with a site of mine. I've always just ignored it, but if theres a solution I'd be very interested.

[clemont]

hmmm, but ignoring it doesn't solve it.
another test: using MSIE gives me a dnserror: "Server not found" after submitting the login-form...!?