SimpleHTTPServer not working

Question

I'm connecting to a VPN (Linux machine) through ssh and invoke the following command there:

sibi::bash-> python -m SimpleHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...

Then, I visit it in it's URL: http://x.x.x.x:8000 and the browser complains me that it is not able to connect.

How to debug this issue ?

( Apache's test page works fine in http://x.x.x.x )

Updated: IP Rules (iptables -L -n)

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22 
REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited 

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited 

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination   

Answer 1

It was clearly an firewall issue.

Flushing the iptables helped in resolving the issue:

sudo iptables -F

But be careful, you may want to set up proper firewall rules for your VPN server.