I have my Yun mounted up on an UNO, reset pins shorted, dedicated ip and port forward on the router. All looks good. Only problem is when I try to upload a sketch just before write the iDuino asks for a password. I type in the password that I set. I end up with AVRdude message Device not responding. Must be something simple. Any articles or pointers appreciated.
Do you have anything connected to pins 11, 12, or 13? When programming over the network, the Linux processor uses the ICSP connector to load a sketch into the AVR processor. On the '32U4 processor used in the actual Arduino Yun board, these are dedicated pins that do not conflict with the shield connector pins. But that's not the case for you. The Uno shares the six pin ICSP connector's SPI lines with pins 11, 12, and 13 - if you have anything connected to those pins it could cause a conflict that would prevent a sketch from being loaded.
The Chineese cloned Yun shield makers like to talk how their boards are just like the official Arduino Yun, but more flexible because they can be used with other boards. But in reality they are not the same and there are some subtle and not-so-subtle differences. This is probably one of those cases.
This forum is really about the official Arduino Yun. Much of what is discussed here is applicable to you, but this sounds like a configuration issue that is unique to your Uno and third party shield setup - you might get better support information from the iDuino folks?