Jenkins Amazon ECS plugin not found

00 Readme.md

Context: fresh Jenkins OSS LTS (1.609.3)

The "Amazon EC2 Container Service" plugin appears in the plugin manager but I get a 404 during the install.

01 jenkins.log

INFO: Starting the installation of Amazon EC2 Container Service plugin on behalf of anonymous
Oct 01, 2015 3:54:17 PM hudson.model.UpdateCenter$DownloadJob run
SEVERE: Failed to install Amazon EC2 Container Service plugin
hudson.util.IOException2: Failed to download from http://updates.jenkins-ci.org/download/plugins/amazon-ecs/1.0/amazon-ecs.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/amazon-ecs/1.0/amazon-ecs.hpi)
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:796)
    at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1143)
    at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1303)
    at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1121)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.FileNotFoundException: http://mirrors.jenkins-ci.org/plugins/amazon-ecs/1.0/amazon-ecs.hpi
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1889)
    at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1884)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1883)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1456)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:756)
    ... 7 more
Caused by: java.io.FileNotFoundException: http://mirrors.jenkins-ci.org/plugins/amazon-ecs/1.0/amazon-ecs.hpi
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1835)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)
    at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2942)
    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:755)
    ... 7 more

02 Plugin Manager Screenshot.log

http://snag.gy/tFNq5.jpg