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  1. ,

    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 Jenkins JIRA by Eric Düll, 1 year ago
Failed to download from http://updates.jenkins-ci.org/download/plugins/durable-task/1.9/durable-task.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/durable-task/1.9/durable-task.hpi)
via Jenkins JIRA by Eric Düll, 1 year ago
Failed to download from http://updates.jenkins-ci.org/download/plugins/durable-task/1.9/durable-task.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/durable-task/1.9/durable-task.hpi)
via Google Groups by Mark Waite, 2 years ago
Failed to download from http://updates.jenkins-ci.org/download/plugins/git-client/1.11.1/git-client.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/git-client/1.11.1/git-client.hpi)
via Stack Overflow by Young
, 1 year ago
Failed to download from http://updates.jenkins-ci.org/download/plugins/multiple-scms/0.6/multiple-scms.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/multiple-scms/0.6/multiple-scms.hpi)
via Google Groups by David Aldrich, 2 years ago
Failed to download from http://updates.jenkins-ci.org/download/plugins/support-core/2.22/support-core.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/support-core/2.22/support-core.hpi)
via Jenkins JIRA by James Howe, 1 year ago
Failed to download from http://updates.jenkins-ci.org/download/plugins/otabuilder/0.3.1/otabuilder.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/otabuilder/0.3.1/otabuilder.hpi)
java.io.IOException: Server returned HTTP response code: 504 for URL: http://mirrors.jenkins-ci.org/plugins/durable-task/1.9/durable-task.hpi	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1840)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)	at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2943)	at java.net.URLConnection.getHeaderFieldLong(URLConnection.java:629)	at java.net.URLConnection.getContentLengthLong(URLConnection.java:501)	at java.net.URLConnection.getContentLength(URLConnection.java:485)	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1007)