Build failed in Jenkins: Ant-Build-Matrix » Open JDK 1.8 (Only on ubuntu nodes),Ubuntu #771

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See <https://builds.apache.org/job/Ant-Build-Matrix/jdk=Open%20JDK%201.8%20(Only%20on%20ubuntu%20nodes),label=Ubuntu/771/>

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Started by upstream project "Ant-Build-Matrix" build number 771
originally caused by:
 Started by an SCM change
Building remotely on ubuntu3 (Ubuntu ubuntu legacy-ubuntu) in workspace <https://builds.apache.org/job/Ant-Build-Matrix/jdk=Open%20JDK%201.8%20(Only%20on%20ubuntu%20nodes),label=Ubuntu/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/ant.git # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/ant.git
 > git --version # timeout=10
FATAL: Failed to fetch from https://git-wip-us.apache.org/repos/asf/ant.git
hudson.plugins.git.GitException: Failed to fetch from https://git-wip-us.apache.org/repos/asf/ant.git
	at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:647)
	at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:889)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:914)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1252)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:615)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:524)
	at hudson.model.Run.execute(Run.java:1706)
	at hudson.matrix.MatrixRun.run(MatrixRun.java:146)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:232)
Caused by: hudson.plugins.git.GitException: Failed to connect to https://git-wip-us.apache.org/repos/asf/ant.git (exception: java.net.NoRouteToHostException: No route to host)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.checkCredentials(CliGitAPIImpl.java:2253)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1169)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:85)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:280)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:153)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:146)
	at hudson.remoting.UserRequest.perform(UserRequest.java:118)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:328)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

Jenkins build is back to normal : Ant-Build-Matrix » Open JDK 1.8 (Only on ubuntu nodes),Ubuntu #772

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See <https://builds.apache.org/job/Ant-Build-Matrix/jdk=Open%20JDK%201.8%20(Only%20on%20ubuntu%20nodes),label=Ubuntu/772/changes>