I have the same issue with Eclipse 3.5. I tried several times to just update 
and got multiple "Unknown host" errors. 
Today I tried to un-install GWT and to re-install the new version, and still 
I get errors.
Here's the message: 
An error occurred while collecting items to be installed
  session context was:(profile=epp.package.jee, 
phase=org.eclipse.equinox.internal.provisional.p2.engine.phases.Collect, 
operand=, action=).
  Unknown Host: 
http://dl.google.com/eclipse/plugin/3.5/plugins/com.google.gdt.eclipse.designer.hosted.1_6_2.3.0.r35x201105061507.jar
  v23.lscache6.c.bigcache.googleapis.com
  Unknown Host: 
http://dl.google.com/eclipse/plugin/3.5/plugins/com.google.gdt.eclipse.designer.hosted.2_0.webkit_win32_2.3.0.r35x201105061507.jar
  v19.lscache2.c.bigcache.googleapis.com
  Unknown Host: 
http://dl.google.com/eclipse/plugin/3.5/plugins/com.google.gwt.eclipse.sdkbundle_2.3.0.r35v201104261923.jar
  v21.lscache2.c.bigcache.googleapis.com
  Unknown Host: 
http://dl.google.com/eclipse/plugin/3.5/plugins/org.eclipse.wb.core.lib_0.9.0.r35x201105061447.jar
  v18.lscache2.c.bigcache.googleapis.com

What can I do next?

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