Forum Moderators: open
<link rel="alternate" type="application/rss+xml"
title="Example.COM RSS" href="/GSRRSS.php">
you might need to change it to:
<link rel="alternate" type="application/rss+xml"
title="Example.COM RSS" href="GSRRSS.php">
(remove the leading / on the destination)
Try that and let me know if it works. I think with the / there, it is trying to reference the root folder (wwww.example.com/file.xml). That page you had linked was in a sub folder (www.example.com/folder/file.xml)