Library Manager: UnknownHostException

Development Tools IDE 1.x
1

Hi team,
I am encountering an issue while accessing the library manager. I am using Arduino IDE ver (1.8.19). Please find the attached screenshot below. I am requesting assistance.

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 Error downloading https://downloads.arduino.cc/libraries/library_index.json
java.lang.RuntimeException: java.lang.Exception: Error downloading https://downloads.arduino.cc/libraries/library_index.json
	at cc.arduino.contributions.libraries.ui.LibraryManagerUI.lambda$onUpdatePressed$2(LibraryManagerUI.java:210)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.Exception: Error downloading https://downloads.arduino.cc/libraries/library_index.json
	at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:145)
	at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:126)
	at cc.arduino.contributions.JsonDownloader.download(JsonDownloader.java:49)
	at cc.arduino.contributions.GZippedJsonDownloader.download(GZippedJsonDownloader.java:66)
	at cc.arduino.contributions.libraries.LibraryInstaller.updateIndex(LibraryInstaller.java:80)
	at cc.arduino.contributions.libraries.ui.LibraryManagerUI.lambda$onUpdatePressed$2(LibraryManagerUI.java:203)
	... 1 more
Caused by: java.net.UnknownHostException: downloads.arduino.cc
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
	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.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
	at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
	at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1199)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:162)
	at cc.arduino.utils.network.HttpConnectionManager.makeConnection(HttpConnectionManager.java:138)
	at cc.arduino.utils.network.HttpConnectionManager.makeConnection(HttpConnectionManager.java:96)
	at cc.arduino.utils.network.FileDownloaderCache.updateCacheInfo(FileDownloaderCache.java:164)
	at cc.arduino.utils.network.FileDownloaderCache.getFileCached(FileDownloaderCache.java:138)
	at cc.arduino.utils.network.FileDownloader.downloadFile(FileDownloader.java:162)
	at cc.arduino.utils.network.FileDownloader.download(FileDownloader.java:125)
	at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:143)
	... 6 more

Thanks,
Anirudh

2

In case you don't already know, it's a network problem. For some reason you computer is not connected to the internet.

3

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