Hi,
You cannot use the temporary url to access pages for ASP as it requires a fully qualified domain name (FQDN), which
http://server.lunarpages.com/~username is not. You would either need to actually have a testing subdomain setup (what you are using is not a subdomain from the link you provided but the temporary url), or you would need to point your domain's DNS nameservers to ours and wait for them to propagate, which takes 48-72 hours.
If you need a testing subdomain setup in the meantime, please write to
support@lunarpages.com and provide your Cpanel username, last 4 digits of your credit card on file with us for verification purposes (no charges apply), the current domain and the new subdomain name you want (in the form subdomain.lunarpages.net as you are on Ganymede which has ns4 & ns5 nameservers so lunarpages.net subdomain is the one it would use), and authorization to make the change.
Please note that once you are done testing, you must reply to that same ticket and request to change back to the prior primary, otherwise your primary domain will not resolve when it does propagate. The reason for this is that changing the domain removes the DNS entries and zones for the prior primary domain, so unless you tell us to change it back when you are ready, then the domain will never resolve.
Thanks.