Vassilis Serasidis

Supposing that you use the https://github.com/stm32duino/Arduino_Core_STM32 Core, a quick fix is to edit the `Ethernet_STM\src\utility\w5100.cpp` file. 1. Replace: `#define STM32_SPI_CS PA4` with `#define STM32_SPI2_CS PB12` 2. Replace all `_STM32F1_` references...

Do you have you the schematic diagram of that board ?

Perhaps PB12 (SCS pin) is not initialized properly. Try to re-initialize it in setup function ``` void setup() { pinMode(PB12, OUTPUT); //

It seems that PA4 was not initialized properly. Try to re-initialize it in setup function ``` void setup() { pinMode(PA4, OUTPUT); //

@brainelectronics Thanks !

@manosv I tried with Arduino IDE 1.5.7 and UIPEthernet 1.07. It works ok. Could you please tell me what exactly is the problem ? A small description of the problem.