Error downloading http://downloads.arduino.cc/packages/package_index.json

[clivepengelly]

I have installed a fresh copy of the IDE but continue to get this error when opening the Boards Manager.

I have followed instructions on the forum to rectify the problem but nothing works.

I am running Windows 10.

I can access this URL from my browser.

I am able to install some of the boards that are listed in the Boards Manager, but most give errors when trying to install.

Error downloading http://downloads.arduino.cc/packages/package_index.json
java.lang.RuntimeException: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$0(ContributionManagerUI.java:151)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:113)
    at cc.arduino.contributions.packages.ContributionInstaller.download(ContributionInstaller.java:330)
    at cc.arduino.contributions.packages.ContributionInstaller.downloadIndexAndSignature(ContributionInstaller.java:305)
    at cc.arduino.contributions.packages.ContributionInstaller.updateIndex(ContributionInstaller.java:283)
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$0(ContributionManagerUI.java:147)
    ... 1 more
Caused by: java.net.SocketException: Address family not supported by protocol family: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:83)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1169)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1148)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
    at cc.arduino.utils.network.FileDownloader.downloadFile(FileDownloader.java:170)
    at cc.arduino.utils.network.FileDownloader.download(FileDownloader.java:128)
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:111)
    ... 5 more

[agdl]

Hi, If you open the preferences menu, you can navigate to the .Arduino15 folder clicking on the preferences path. Then open the folder staging/packages and try to delete all the archive you have there. Please let me know if the problem persist.

[clivepengelly]

Hi.

Thanks for the reply.

Deleted the folder, same problem.

[agdl]

Can you please give a try to this?

http://stackoverflow.com/questions/16373906/address-family-not-supported-by-protocol-family-socketexception-on-a-specific/21383865#21383865

[clivepengelly]

GENIUS!

This worked.

I am surprised that many more people do not have this problem. I do not have anything special in my environment.

This is what I had to do – nothing else:-

1. Open command prompt (windows start button, type cmd in search)
2. Click top left of command prompt, click properties, enable quick edit mode
3. Copy: setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true
4. Right click on command prompt, should paste
5. Hit enter. That easy!

[cmaglie]

@clivepengelly
from the linked article it seems that the problem is caused by a spyware:

Try to check whether the spy program called "RelevantKnowledge" is installed. Its
uninstallation helped me to solve the problem.

You may probably want to check if you have this program installed too.

BTW happy that you solved it!

[clivepengelly]

I do have this relevant knowledge thing running. What is it and where does it come from?

I download a lot of development and test software.

[cmaglie]

It doesn't surely come from Arduino.
Probably you installed it bundled with some other software, without noticing.

From a quick search on google:
http://www.relevantknowledge.com/faq.aspx
http://www.shouldiremoveit.com/RelevantKnowledge-12964-program.aspx

[sachin1389]

Please help the problem still exist for me

I have done:

setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true

on command prompt. I am getting "Success: specified value was saved".

I also checked for the relevant knowledge spy.

I also tried Arduino 1.6.8.

I also deleted archives in arduino15 file.

I'm still getting the error:

 Error downloading http://downloads.arduino.cc/packages/package_index.json
java.lang.RuntimeException: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:151)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:113)
    at cc.arduino.contributions.packages.ContributionInstaller.download(ContributionInstaller.java:330)
    at cc.arduino.contributions.packages.ContributionInstaller.downloadIndexAndSignature(ContributionInstaller.java:305)
    at cc.arduino.contributions.packages.ContributionInstaller.updateIndex(ContributionInstaller.java:283)
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:147)
    ... 1 more
Caused by: java.net.SocketTimeoutException: Connect timed out
    at java.net.SocksSocketImpl.readSocksReply(SocksSocketImpl.java:126)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:459)
    at java.net.Socket.connect(Socket.java:589)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1169)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1148)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
    at cc.arduino.utils.network.FileDownloader.downloadFile(FileDownloader.java:170)
    at cc.arduino.utils.network.FileDownloader.download(FileDownloader.java:128)
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:111)
    ... 5 more
 Error downloading http://downloads.arduino.cc/packages/package_index.json
java.lang.RuntimeException: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:151)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:113)
    at cc.arduino.contributions.packages.ContributionInstaller.download(ContributionInstaller.java:330)
    at cc.arduino.contributions.packages.ContributionInstaller.downloadIndexAndSignature(ContributionInstaller.java:305)
    at cc.arduino.contributions.packages.ContributionInstaller.updateIndex(ContributionInstaller.java:283)
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:147)
    ... 1 more
Caused by: java.net.SocketTimeoutException: Connect timed out
    at java.net.SocksSocketImpl.readSocksReply(SocksSocketImpl.java:126)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:459)
    at java.net.Socket.connect(Socket.java:589)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1169)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1148)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
    at cc.arduino.utils.network.FileDownloader.downloadFile(FileDownloader.java:170)
    at cc.arduino.utils.network.FileDownloader.download(FileDownloader.java:128)
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:111)
    ... 5 more
 Error downloading http://downloads.arduino.cc/packages/package_index.json
java.lang.RuntimeException: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:151)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:113)
    at cc.arduino.contributions.packages.ContributionInstaller.download(ContributionInstaller.java:330)
    at cc.arduino.contributions.packages.ContributionInstaller.downloadIndexAndSignature(ContributionInstaller.java:305)
    at cc.arduino.contributions.packages.ContributionInstaller.updateIndex(ContributionInstaller.java:283)
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:147)
    ... 1 more
Caused by: java.net.SocketTimeoutException: Connect timed out
    at java.net.SocksSocketImpl.readSocksReply(SocksSocketImpl.java:126)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:459)
    at java.net.Socket.connect(Socket.java:589)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1169)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1148)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
    at cc.arduino.utils.network.FileDownloader.downloadFile(FileDownloader.java:170)
    at cc.arduino.utils.network.FileDownloader.download(FileDownloader.java:128)
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:111)
    ... 5 more
 Error downloading http://downloads.arduino.cc/packages/package_index.json
java.lang.RuntimeException: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:151)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Error downloading http://downloads.arduino.cc/packages/package_index.json
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:113)
    at cc.arduino.contributions.packages.ContributionInstaller.download(ContributionInstaller.java:330)
    at cc.arduino.contributions.packages.ContributionInstaller.downloadIndexAndSignature(ContributionInstaller.java:305)
    at cc.arduino.contributions.packages.ContributionInstaller.updateIndex(ContributionInstaller.java:283)
    at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onUpdatePressed$19(ContributionManagerUI.java:147)
    ... 1 more
Caused by: java.net.SocketTimeoutException: Connect timed out
    at java.net.SocksSocketImpl.readSocksReply(SocksSocketImpl.java:126)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:459)
    at java.net.Socket.connect(Socket.java:589)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1169)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1148)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
    at cc.arduino.utils.network.FileDownloader.downloadFile(FileDownloader.java:170)
    at cc.arduino.utils.network.FileDownloader.download(FileDownloader.java:128)
    at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:111)
    ... 5 more

[sachin1389]

Hey Problem solved,I just tried remove as much software which was seeing to be unknown to me
and then deleted the arduino and reinstalled and then restarted my pc . now it is working fine.

[adam4142]

Its worked ...........
you r a GENIUS>............

[ArimoJak7]

thanks
it worked

[paulenuta]

I had same error, but could not even manually open the http://downloads.arduino.cc/packages/package_index.json list.
I solve the problem be restarting PPOE connection to the ISP on the internet Router.