A cool and simple theme for your site..
You set up a new DNS server for co.cc right!!
now go to
http://tehblog.exofire.net/blog/wp-login.php
and navigate to this page
www.yoursite/wp-admin/options-general.php
and see what the WordPress address and Blog address (URL) reset this values to your new DNS server i hope this would resolve your cookie problem..
If this works try giving me rep or credits..
Good luck...
Edit:
to say it more accurately change the Blog address(URL) alone this is enough i think,...