... (snip)... Apparently the arduino has to be powered up a fraction of a second before the wiznet shield is powered up. ... (snip)... The issue can be duplicated with an arduino with a non PoE shield installed. Install a simple web server code on the combo and verify it works using a browser. Then unplug/replug the USB connector to the pc to power cycle the arduino/shield. Once the arduino boots up, try to connect to the arduino with the browser. The attempt will fail.
I did that test. My shield's server comes up fine. ??
when you say POE shield, do you mean shield with POE installed?
FWIW, I power cycled using external power (not using USB) and it works every single time. So this is not the same issue as the old thread, as I don't remember reading any mention of problem uploading (or I may have missed it).
I just removed R1 and C3 and now I can upload sketch without removing the ethernet shield or pressing reset right before the upload.