The IDE is now using your system proxy settings. On windows, they are under Control Panel > Internet Options (on Windows 7 at least)

Thanks for your answer, but the problem persists.

Is there not a way of manually installing the Due support?

No. Can you confirm you're behind a proxy and you have set it to up correctly? Maybe your browser is using its own proxy settings, ignoring the system ones: that would explain why you can browse but the IDE fails. Have you also tried restarting the IDE once you've set up proxy settings?

I might be under company proxies that can't be changed and are changed back to default when I change them. Yes, I have restarted the IDE after modifying the proxy settings. I have checked my browser's settings, and it is using the system settings.

With "might" you mean you don't know? Maybe your company proxy is also filtering traffic

When I say "might", I mean I am under company proxy settings. I have just confirmed it.

As a workaround, you can manually download the files specified in the dependent tools. Latest SAM core requires tools arm-none-eabi-gcc version 4.8.3-2014q1 and bossac version 1.3a-arduino. Download the i686-mingw32 version of both and move the files into %APPDATA%\Arduino15\staging. It should work.
A more permanent solution is to contact your network administrators and make them open the proxy for the IDE

I have downloaded both tools and moved them into the %APPDATA%\Arduino15\staging folder, so that it looks like this:

I have also left the files I manually downloaded for the SAM core in C:\Arduino\arduino-1.6.5\hardware\arduino\sam, so that it looks like this:

Unfortunately, I am still getting Cannot run program "{runtime.tools.arm-none-eabi-gcc.path}\bin\arm-none-eabi-g++" (in directory "."): CreateProcess error=2, The system cannot find the file specified in the IDE's command prompt when I try to compile a sketch for the Due. I can only assume that either I haven't copied the files over correctly, or the path to the arm-none-eabi-g++ has not been defined somewhere.
Thanks for your help in this. If you can't think of any further potential solutions, I will go see the network admins. They usually take a week or so to come back, but I'll see what happens.

In staging folder there must no packages folder. Just packed zip/bz2 files files. Then open Boards Manager and install SAM core. It won't download anything because every file is already downloaded. It will just install them

Sorry I meant packed zip file

And I was mistaken again: correct folder is %APPDATA%\Arduino15\staging\packages, so, yes, a packages folder is needed

Beautiful, this worked! Tante grazie per l'aiuto!

If this can help, I got the same message but this was because I forgot to unconnect Arduino wifi on my computer. Doing so and having an internet connection back, it worked well.

Olivier

Hey I'm having the same problem and was wondering if anyone could help.

I've done the steps above but still receive the Cannot run program "{runtime.tools.arm-none-eabi-gcc.path}\bin\arm-none-eabi-g++" (in directory "."): CreateProcess error=2, The system cannot find the file specified message when compiling for the Due.

When using the boards manager to update, I receive the error `CRC doesn't match. File is corrupt'

When manually downloading the file gcc-arm-none-eabi-4.8.3-2014q1-windows.tar.gz from http://arduino.cc/download.php?f=/gcc-arm-none-eabi-4.8.3-2014q1-windows.tar.gz I still receive a corrupted file.

Any ideas?

Thanks for any tips.

Andy

How does Arduino detect system settings on Linux?
And which system settings? Because last I checked there wasn't any unified model for proxy system settings on Linux.
Or at least, how can I hijack the preferences.txt to add my own proxy files?

Open command prompt (windows start button, type cmd in search)
Click top left of command prompt, click properties, enable quick edit mode
Copy: setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true
Right click on command prompt, should paste

Source:http://stackoverflow.com/questions/16373906/address-family-not-supported-by-protocol-family-socketexception-on-a-specific

I had the error too. Deleting all tmp files in the C:\Users\xxx\AppData\Local\Arduino15 folder worked for me.

For anyone else who needs to get an Arduino Due installed into the Arduino IDE while offline (eg on an isolated network), it is possible. For a Win 7 PC here with Arduino IDE 1.8.5, a specific directory structure needed creating, with the files mentioned above being populated into it.

The files needed were:

• http://downloads.arduino.cc/cores/sam-1.6.11.tar.bz2
• http://downloads.arduino.cc/bossac-1.6.1-arduino-mingw32.tar.gz
• http://downloads.arduino.cc/gcc-arm-none-eabi-4.8.3-2014q1-windows.tar.gz

The %APPDATA% directory mentioned above (on this PC) resolves to C:\Users\USERNAME\AppData\Local. So the directory structure needed was:

• C:\Users\USERNAME\AppData\Local\Arduino15\packages\arduino\hardware\sam\1.6.11\

  • Extract files from sam-1.6.11.tar.bz2 into this. Make sure the cores, firmwares (etc) structure is directly under the 1.6.11 folder after being extracted. (you may need to remove a sam subfolder that otherwise gets in the way)

• C:\Users\USERNAME\AppData\Local\Arduino15\packages\arduino\tools\arm-none-eabi-gcc\4.8.3-2014q1

  • Extract the gcc archive in here, such that the arm-none-eabi, bin, lib, and share folders are directly underneath it. You'll probably need to remove the top level gcc-arm-none-eabi-4.8.3-2014q1 folder from the archive to make this happen.

• C:\Users\USERNAME\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.6.1-arduino

  • Extract bossac.exe from it's download archive directly into this folder.

With this done, the Arduino Due shows up in the board list in the Arduino Due, sketches compile and upload properly, etc.

As a data point, it's also possible to manually download package_index.json and package_index.json.sig, and place them in C:\Users\USERNAME\AppData\Local\Arduino15. The "Boards Manager" dialog will then populate correctly and display the board list, even though being disconnected means it can't really do much. Note the .sig file is needed, as package_index.json is ignored without it.

How should I go about this on Linux?

Probably very similar, but the path to Arduino15 would be somewhere in your home directory instead.

If you can figure out what that path is, you should be able to work out the corresponding paths from those above. 😄

As a data point, I don't have any Arduino stuff around any more (doing different things), so probably not able to help in depth. The above should be a good start though. 😄