am using internet via bluetooth (tethering) via my android phone.
dynamic ip is enabled.
using internet via tethering from my android phone...so i guess dont have any router issue...firewall is off..
That is not exactly true. Your phone is acting as a router in this case. I did a quick Google search and it appears many people are asking about port forwarding in relation to tethering on the phone so that functionality might no be there by default. I have never attempt to do this so I can not tell you for sure what works and what does not work.
You might want to start by looking at something like this:https://play.google.com/store/apps/deta ... .net&hl=en
I would also make sure that you can contact your phone IP first from the internet to make sure your carrier is not blocking that. If that does not work, you will need to do some searching around on google or other places to see what other people have done.