pylon:
Have you ensured your mobile just communicates over WLAN and not the mobile network? I guess your Arduino is not visible in the Internet, it's just showing up inside your LAN.
thanks for ur reply,
ya i am sure its communicating with WLAN. While testing first time it got connected well and i got perfect output. The next day without changing anything, i thought to show the output to my friends, but i was fooled with the error in android mobile "server failed to communicate. Try again later". =(
But still i am getting good output in my laptop and it communicates with ethernet shiled and router. but android mobile only problems.
And important note is that,from the time i got the first output, i didnt made any changes in the project. but it shows error.