Redirecting old vB forum URLs to new IPS URLs

[RooMac]

Hi,

I converted my vB forum to IPS. The vB forum was at root /public_html/ whereas I've installed the IPS at /public_html/forum/ directory - on same server.

As per the IPS conversion guide, I've configured and installed the vB redirection files into IPS folder /public_html/forum/

I believe that this step is to redirect the vB links posted into the posts. But I need to know, when I'm pointing direct link of old vB thread (which was installed at server's root) in my browser, why I'm not been automatically coming to equivalent IPS thread?

After reading some topics on forums, I edited the forum.php file of old vB forum with this code to redirect users to new IPS (if they're accessing a direct link of old vB forum), but this also not seems to work.

<?php
/* Redirect browser */
header("Location: http://hifiwigwam.com/forum/");
 
/* Make sure that code below does not get executed when we redirect. */
exit;
?>

What should I do? Please help me to fix this issue. I think it is a .htaccess file issue but I don't know what to do. A step to step guide would be much appreciated.

Thanks

P.S:  Also, my WP site is installed on server root /public_html/