I ordered a web hosting account yesterday, but I am unable to view the site at http://mydomainname.com nor am I able to FTP into the server at ftp.mydomainname.com - What could the problem be?
This could be due to a couple of reasons:
1) You have not yet set your Domain Nameserver Settings.
2) The Domain Nameserver Settings have not yet taken effect - they can take up to 48 hours. For instructions on changing your DNS server settings, see the Domain Names / DNS section.