What is OVM linux box? Are you using Oracle VM server for x86 or Oracle VM VirtualBox.
If you want to test whether or not the Firewall is the problem, simply disable it for the duration of your test:
service iptables stop
If you using Oracle VM VirtualBox, your ability to reach the virtual machine from your host depends on how you have setup the virtual machine network adapter, which restricts access based on NAT, host-only or internal network configurations. Check VirtualBox manual.
iam using OVM linux 6.4. and I can telnet to port 22 from my windows box to ovm , so why not to port 8000?
[root@OEL6EBS12 ~]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Tue Apr 9 15:00:32 2013
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state state NEW -m tcp dport 8000 -j ACCEPT
-A INPUT -p tcp -m state state NEW -m tcp dport 4443 -j ACCEPT
-A INPUT -p tcp -m state state NEW -m tcp dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
# Completed on Tue Apr 9 15:00:32 2013