Did a ifconfig and check its IP address there.
Bring up the Pi as web server.
From nearby client computer trying to connect to Pi which supposed to serve up the web pages.
Web pages not found!
From my client computer I did Ping to Pi, first 5 seconds request time out then after that, communication is established.
Now the web pages are served correctly.
It happens periodically,I need to use ping to re-establish the communication and have the Pi server back on.
So annoying, What cause this to happen?