When transferring an existing name server and the website was using a content management system (CMS) based on PHP-Nuke, you may have to wait until the registrars fully update before you can access the websites with username and password. This is due to the cookie validation process that the CMS systems use. When using the interim web address (i.e. http://box#..com/~websitename) the CMS will attempt to assign cookies for the website you have assigned in the system (most likely www.mywebsite.com).
Keywords: PHP nuke CMS php-nuke phpnuke