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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

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java.net.UnknownHostException: jeremylong.github.io	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:208)	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:176)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:402)	at java.net.Socket.connect(Socket.java:590)	at sun.net.NetworkClient.doConnect(NetworkClient.java:187)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:417)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:512)	at sun.net.www.http.HttpClient.(HttpClient.java:227)	at sun.net.www.http.HttpClient.New(HttpClient.java:320)	at sun.net.www.http.HttpClient.New(HttpClient.java:336)	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1004)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:940)	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:858)	at org.owasp.dependencycheck.data.update.EngineVersionCheck.getCurrentReleaseVersion(EngineVersionCheck.java:214)	at org.owasp.dependencycheck.data.update.EngineVersionCheck.shouldUpdate(EngineVersionCheck.java:148)	at org.owasp.dependencycheck.data.update.EngineVersionCheck.update(EngineVersionCheck.java:113)	at org.owasp.dependencycheck.Engine.doUpdates(Engine.java:492)	at org.owasp.dependencycheck.Engine.analyzeDependencies(Engine.java:346)	at org.owasp.dependencycheck.maven.MavenEngine.analyzeDependencies(MavenEngine.java:95)	at org.owasp.dependencycheck.maven.CheckMojo.runCheck(CheckMojo.java:97)	at org.owasp.dependencycheck.maven.BaseDependencyCheckMojo.execute(BaseDependencyCheckMojo.java:423)	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:88)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)	at java.lang.reflect.Method.invoke(Method.java:613)