Cool, so I've had an Airport Express Gen 1 for ages. This weekend I reset it to create a wireless network to allow me to control DeeJay app on my pad and airplay the music to a pa system.
Now I came to reset and get it back on my network again I get error code 10057.
I did the factory defaults setting by holding a pen in the reset slot but even though Airport Utility scans and finds it it will still say 10057 network error when trying to configure it.
Just about to give up I thought I'd check to see if it was still producing a wifi signal as per the setup from the weekend.
On my iPhone 4 I went into the wifi settings to see if the ssid was being broadcast and it wasn't BUT underneath the list of my network and neighbours wifi was another option,
Setup Airport Express!!
Amazing, I followed the path of questions to change it to join a network instead of create a network and all now works tickety boo!!!
I don't normally post stuff on forums but if this helps someone else by getting them to check in an apple device settings to check for the airport, it might be worth it.