My members can't reset their passwords

Imported my phpbb board through vbulletin, everything went fine, but my members can't reset their passwords. The password reset email gets sent, but when you click the link, the following error is given:
Not Found

The requested URL /forums/index.php was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

The install is clean, not modified in any way.
 
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