Oomph proxy error message

gistfile1.txt

!SESSION 2015-06-30 13:46:11.327 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_DE
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -data @none

!ENTRY org.eclipse.oomph.base 2 0 2015-06-30 13:49:28.495
!MESSAGE org.eclipse.oomph.util.IOExceptionWithCause: HttpComponents connection error response code 503.
!STACK 0
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$1DiagnosticWrappedException: org.eclipse.oomph.util.IOExceptionWithCause: HttpComponents connection error response code 503.
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:319)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:278)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$ResourceLocator.demandLoadHelper(ResourceSetImpl.java:804)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$MappedResourceLocator.getResource(ResourceSetImpl.java:1204)
	at org.eclipse.oomph.setup.internal.core.util.SetupCoreUtil$1.getResource(SetupCoreUtil.java:295)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:352)
	at org.eclipse.oomph.base.util.BaseUtil.loadResourceSafely(BaseUtil.java:54)
	at org.eclipse.oomph.setup.ui.wizards.ProjectPage$AddUserProjectDialog.processResources(ProjectPage.java:1686)
	at org.eclipse.emf.common.ui.dialogs.ResourceDialog.okPressed(ResourceDialog.java:372)
	at org.eclipse.jface.dialogs.Dialog.buttonPressed(Dialog.java:466)
	at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:619)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4180)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3769)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:827)
	at org.eclipse.jface.window.Window.open(Window.java:803)
	at org.eclipse.oomph.setup.ui.wizards.ProjectPage$2.widgetSelected(ProjectPage.java:247)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4180)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3769)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:827)
	at org.eclipse.jface.window.Window.open(Window.java:803)
	at org.eclipse.oomph.setup.internal.installer.InstallerDialog.show(InstallerDialog.java:363)
	at org.eclipse.oomph.setup.internal.installer.InstallerApplication.run(InstallerApplication.java:215)
	at org.eclipse.oomph.setup.internal.installer.InstallerApplication.start(InstallerApplication.java:271)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
Caused by: org.eclipse.oomph.util.IOExceptionWithCause: HttpComponents connection error response code 503.
	at org.eclipse.oomph.setup.internal.core.util.ECFURIHandlerImpl.createInputStream(ECFURIHandlerImpl.java:266)
	at org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl.createInputStream(ExtensibleURIConverterImpl.java:360)
	at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1269)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:259)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:274)
	... 41 more
Caused by: org.eclipse.ecf.filetransfer.IncomingFileTransferException: HttpComponents connection error response code 503.
	at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer.openStreams(HttpClientRetrieveFileTransfer.java:662)
	at org.eclipse.ecf.provider.filetransfer.retrieve.AbstractRetrieveFileTransfer.sendRetrieveRequest(AbstractRetrieveFileTransfer.java:885)
	at org.eclipse.ecf.provider.filetransfer.retrieve.AbstractRetrieveFileTransfer.sendRetrieveRequest(AbstractRetrieveFileTransfer.java:576)
	at org.eclipse.ecf.provider.filetransfer.retrieve.MultiProtocolRetrieveAdapter.sendRetrieveRequest(MultiProtocolRetrieveAdapter.java:106)
	at org.eclipse.oomph.setup.internal.core.util.ECFURIHandlerImpl.createInputStream(ECFURIHandlerImpl.java:201)
	... 45 more