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I really don't know what's going on with Eclipse 3.5 (3.5.0 or 3.5.1, same issues), but it's been now 2 days that I'm struggling with Eclipse to find a way to make the plugins installation work via the "Install New Software screen"!!! I have visited a lot of forums and blogs, tried many solutions but in vain: each time the current problem disappears and a new one appears.
I'm trying to make it work at my office, so behind proxy. The best advice I got so far is the one regarding the known issue with NTLM proxies: http://wiki.eclipse.org/ECF_Filetransfer_Support_for_NTLMv2_Proxies. I put in place the hint, but now I have a new error message: Eclipse cannot find the repositories at all... For instance here is what I get now with the Galileo update site itself:
org.eclipse.equinox.internal.provisional.p2.core.ProvisionException: No repository found at http://download.eclipse.org/releases/galileo. at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.fail(AbstractRepositoryManager.java:380) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:606) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:88) at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProvisioningUtil.loadMetadataRepository(ProvisioningUtil.java:88) at org.eclipse.equinox.internal.provisional.p2.ui.QueryableMetadataRepositoryManager.doLoadRepository(QueryableMetadataRepositoryManager.java:55) at org.eclipse.equinox.internal.provisional.p2.ui.QueryableRepositoryManager.loadRepository(QueryableRepositoryManager.java:195) at org.eclipse.equinox.internal.provisional.p2.ui.QueryableRepositoryManager.loadAll(QueryableRepositoryManager.java:108) at org.eclipse.equinox.internal.p2.ui.sdk.PreloadingRepositoryHandler$2.run(PreloadingRepositoryHandler.java:71) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Samething with http://download.eclipse.org/eclipse/updates/3.5, or http://download.eclipse.org/tools/mylyn/update/e3.4/ and whatever the site: no one works.
Please somebody help!
PS: Some more details below:
I have the same issue with third party software too... for instance: http://www.epic-ide.org/updates/testing/site.xml.... same error message.
If I go to Preferences > Install / Updates > Available Software Sites, click on whatever the site and on Test Connection I get a ProvisionException with this error message (when I click on details):
Unable to read repository at http://download.eclipse.org/technology/epp/packages/galileo/site.xml. Unable to read repository at http://download.eclipse.org/technology/epp/packages/galileo/site.xml. Server redirected too many times (20)
the solution is: add following lines to your eclipse.ini file (before -vmargs): (verified on 3.5 ; 3.5.1; 3.6.2)
-Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclient -Dhttp.proxyPort=8080 -Dhttp.proxyHost=myproxy -Dhttp.proxyUser=mydomain\myusername -Dhttp.proxyPassword=mypassword -Dhttp.nonProxyHosts=localhost|127.0.0.1 
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Use the "Help -> Install New Software" menu, it will open a dialog where you can add a new update site (use the "add" button). Once you have added the update site, select it and its content will appear.
Use the following setting and you will be all set. Go to Window --> Preference --> General --> Network Connection --> select Direct from drop down
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