How to solve the connection when install aws toolkit on eclipse Neon?
<p>I am in a company, and need set proxy to connect to the Internet. The proxy setting is ok, because I can connect to other website, e.g. Neon - <a href="http://download.eclipse.org/releases/neon" rel="noreferrer">http://download.eclipse.org/releases/neon</a>, but not for <a href="http://aws.amazon.com/eclipse" rel="noreferrer">http://aws.amazon.com/eclipse</a>.</p>

<p>The error message is:</p>

<blockquote>
  <p>Unable to read repository at
  <a href="https://aws.amazon.com/eclipse/content.xml" rel="noreferrer">https://aws.amazon.com/eclipse/content.xml</a>. Unable to read repository
  at <a href="https://aws.amazon.com/eclipse/content.xml" rel="noreferrer">https://aws.amazon.com/eclipse/content.xml</a>.
  sun.security.validator.ValidatorException: PKIX path building failed:
  sun.security.provider.certpath.SunCertPathBuilderException: unable to
  find valid certification path to requested target.</p>
</blockquote>

<p>The specific stack is:</p>

<blockquote>
  <p>javax.net.ssl.SSLHandshakeException:
  sun.security.validator.ValidatorException: PKIX path building failed:
  sun.security.provider.certpath.SunCertPathBuilderException: unable to
  find valid certification path to requested target
        at sun.security.ssl.Alerts.getSSLException(Unknown Source)
        at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
        at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
        at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
        at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
        at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
        at sun.security.ssl.Handshaker.processLoop(Unknown Source)
        at sun.security.ssl.Handshaker.process_record(Unknown Source)
        at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
        at org.apache.http.conn.ssl.SSLSocketFactory.createLayeredSocket(SSLSocketFactory.java:554)
        at org.apache.http.conn.ssl.SSLSocketFactory.createLayeredSocket(SSLSocketFactory.java:435)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.updateSecureConnection(DefaultClientConnectionOperator.java:216)
        at org.apache.http.impl.conn.ManagedClientConnectionImpl.layerProtocol(ManagedClientConnectionImpl.java:394)
        at org.apache.http.impl.client.DefaultRequestDirector.establishRoute(DefaultRequestDirector.java:814)
        at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:615)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
        at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
        at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientFileSystemBrowser.runRequest(HttpClientFileSystemBrowser.java:263)
        at org.eclipse.ecf.provider.filetransfer.browse.AbstractFileSystemBrowser$DirectoryJob.run(AbstractFileSystemBrowser.java:69)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
      Caused by: sun.security.validator.ValidatorException: PKIX path building failed:
  sun.security.provider.certpath.SunCertPathBuilderException: unable to
  find valid certification path to requested target
        at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
        at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
        at sun.security.validator.Validator.validate(Unknown Source)
        at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
        at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
        at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown
  Source)
        ... 20 more
      Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to
  find valid certification path to requested target
        at sun.security.provider.certpath.SunCertPathBuilder.build(Unknown
  Source)
        at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown
  Source)
        at java.security.cert.CertPathBuilder.build(Unknown Source)
        ... 26 more</p>
</blockquote>