Cannot resolve hostname?

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http://askubuntu.com – I' using lucid 10.04 i used centrify agent to add my ubuntu machine into AD. The machine name is suppose to be abc.company.edu.uk. I have edited /etc/hosts file. It says as abc.company.edu.uk abc. In etc/resolve.conf i have specified dns servers. Do i need to change anything in nsswitch.conf files. When i try to ping from other lan pc to abc.company.edu.pk i get no reply? Kindly help. (HowTos)