Why can I not access imgur.com and gravatar.com from Ubuntu but can do so from Windows?

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http://askubuntu.com – I have this strange problem, I am unable to access imgur.com from Ubuntu ! I have checked the /etc/hosts file, there seems to no entry related to imgur. I can access it from Windows(same connection). I cannot ping it or traceroute it, I cannot even ping the IP of imgur. I have cleared iptables too, what could be the cause ? i cannot access gravatar.com too !! I just noticed that sorry. Running host imgur.com (the same output with google's dns servers) gowtham@gowtham-hacktohell:~$ host imgur.com imgur.com has address imgur.com has address imgur.com has address 54 (HowTos)