can't get fsockopen() to work through IIS

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I have PHP 5.2.6 installed under Windows Server 2003 and IIS 6.0. I cannot 
get fsockopen() to succeed when run through IIS.
I'm using this script:
<?php
$host = "localhost";
$port = "110";
?>
<html>
<h1>Attempting to open socket on host '<?php echo ("$host")?>' at port 
'<?php echo ("$port")?>'</h1>
<h2>
<?php
 $errno = 0;
 $errstr = "<no error reported>";
 $fp = @fsockopen($host, $port, $errno, $errstr);
 if ($fp) {
  echo "Socket connection established";
  fclose($fp);
 }
else {
        echo "Could not connect to $host at port $port (\$errno=$errno; 
\$errstr=$errstr)";
 }
?>
</h2>
</html>

When I run it through a Web browser $fp is null, $errno is 0 and $errstr is 
empty. When I run it from a command line, using the IIS Internet user's 
credentials, the connection succeeds and $fp is non-null.

I would appreciate any suggestions. 



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