I have made an account at redhat and got a key for rhel6 but when i try to register my system it says

Fatal error: We can’t contact Red Hat Network server. Double check the location provided –is ‘http://xmlrpc.rhn.redhat.com/XMLRPC’ correct? If not, you can correct it and try again.

its strange that i can open rhn.redhat.com in firefox but not any website...BUT when i try to login using those credentials suddenly it stops browsing!!

my system can ping any website but only opens rhn.redhat.com in browser

i have disabled selinux/firewall but no result..

any idea why this happening?