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    401 means "Unauthorized", so there must be something with your credentials. You need to pass the authentication to let the server know its a valid user. Check whether the authentication details are provided.

Solutions on the web

via GitHub by endian0A
, 1 year ago
Server returned HTTP response code: 503 for URL: http://www.exploitpack.com/changelog/appversion
via Stack Overflow by DerKerl
, 3 months ago
via Stack Overflow by Jake
, 2 years ago
Server returned HTTP response code: 503 for URL: http://kissmanga.com/
via Stack Overflow by user6753358
, 1 week ago
Server returned HTTP response code: 403 for URL: the link
via Stack Overflow by Asha
, 2 years ago
Server returned HTTP response code: 403 for URL: http://rosettacode.org/mw/images/3/3c/Lenna50.jpg
java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.exploitpack.com/changelog/appversion	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1840)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)	at java.net.URL.openStream(URL.java:1045)	at exploitpack.SplashScreen$paintProgress.run(SplashScreen.java:123)	at java.lang.Thread.run(Thread.java:745)