http://mysitedomain.comBut did not work with:
http://www.mysitedomain.comLater it was traced that, by default the www was not included while creating the domain.
So if you are creating a domain, don't forget to inlcude www (by checking a checkbox next to www). That will keep yourself away from the worry.
If you have already created the domain and have the problem, you can always go and edit the domain (from the very first page that lists all the domains) and update it to include www.