SurferTim:
I have solved this.
I forget to wire pin 10,11,12,and 13 from Eth Shield to UNO.If the ethernet shield was wired to the Arduino ICSP, then I think all you needed to connect was digital pin 10. Digital pins 11-13 are not connected to anything on the newer ethernet shields.
Oh, so digital pins 11-13 can be use for other purpose, as output like that?
Then I wire from Mega to Eth Shield: pin 53 to pin 10, pin 52 to pin 13, pin 51 to pin 12, pin 50 to pin 11
any wrong with my wiring?Connect digital pin 10 to digital pin 10, not 53.
I think you have the MISO and MOSI pins reversed also. Pin 11 to 51 and pin 12 to 50. But this may not work if the ethernet shield is a newer model. Best to connect ICSP to ICSP.edit: Also connect digital pin 4 to digital pin 4 on both. That is the SS for the SD card.
Both the Uno and the Mega should wire the same. ICSP to ICSP, 10 to 10, and 4 to 4.
Oh yeah, I mistype for the MOSI and MISO.
Now I connect only the ICSP and the pin 10 to pin 10, then IT WORKS!!!!!!!!!!!
YOU ARE SO GENIOUS!!!
Now it shows: server is at 192.168.1.177
PROBLEM SOLVED!
a lot of thanks for johnwasser and SurferTim 