Here's a script that'll make PHP4(CGI) fail immidiately every other time the script is started:

<?
define(BASENAVN,         "db");
define(MACHINENAME,      "localhost");
define(DBUSERNAME,       "user");
define(DBPASSWORD,       "pass");

$base = mssql_pconnect(MACHINENAME, DBUSERNAME, DBPASSWORD);
?>
<html>
<head>
</head>
<body>
Really, really strange...
<script language="javascript">
window.location='test.php';
</script>
</body>
</html>

Problem goes away if I remove the pconnect... Win2K+IIS5. PHP3 fails as well..

Mikkel.