PHP文件复制：权限被拒绝

I'm trying to copy a file from one web server to another within our company. Someone else had a similar question here which was solved for them using the approach below.

However, when I try this I get the message "failed to open stream: Permission denied". The default login for the IIS web service is "Local System". Should I ask IT to assign a "network" login for this service, as they have suggested? Is there a better solution?

<?php

$from = "\\\\belqcdata01\\c$\\inetpub\\wwwroot\\productspecs\\certificate.pdf";
$to = "\\\\akudata01\\c$\\inetpub\\wwwroot\\productspecs\\certificate2.pdf";

if(!@copy($from, $to))
{
    $errors= error_get_last();
    echo "COPY ERROR: ".$errors['type'];
    echo "<br />
".$errors['message'];
} else {
  echo "File copied to remote!";
}

?> 

Thanks, Kevin