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NTP syncs with local timeserver but not NTP pool servers

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http://serverfault.com – I setup an NTP server on a machine in another subnet and tried to ync my machine with the server and it works well. But when I try to ust the pool.ntp.org servers (I tried 0.pool.ntp.org, 1.pool.ntp.org, etc. and just pool.ntp.org servers), it does not sync. nslookup on pool.ntp.org as well as 0.pool.ntp.org gives proper DNS resolution and ping works on the IPs returneed by nslookup as well. Output of iptables grepped for UDP is as follows: [Thu Feb 10 12:39:14 root@root-ubuntu:~]# iptables -L -n -v | grep udp 92 13001 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 st (HowTos)