I have managed to get Eclipse Juno connecting to the internet. For this to accomplish, there are many posts here on stackoverflow. here is one of this links: Eclipse not connecting to internet via proxy
Today i installed Eclipse Kepler on my Windows7 box. But accessing the eclipse marketplace or installing new software does not work. I am using exactly the same proxy configuration as i used for Eclipse Juno. Juno can access the marketplace but Kepler does not. The proxy uses NTLM Authentification. Any one here with similar problem?
No success til now. I am still wondering why Juno can connect whereas Kepler can not:-(
I had same issue. I searched and found this.
http://oakgreen.blogspot.jp/2011/10/eclipse-proxy-settings-bug-and.html
This post says don't set SOCKS proxy. I tried this advice, and connection was succeeded. I did below:
- Open Network Connection Settings.
- Select Active Provider to "Manual".
- Set HTTP/HTTPS proxy.
- Clear SOCKS proxy if this is set.(select SOCKS proxy row and click "Clear" button)
- Restart Eclipse to apply these settings.
I spent hours trying to use this method suggested by mhanada and although it is correct and should have worked the default Secure Storage associated with eclipse was preventing my proxy credentials from being saved. I advise: Be wary of exceptions being thrown regarding Secure Storage. In my case the errors related to being unable to connect to a remote location where the default secure storage path was. In my case I just deleted the Default Secure Storage information via Preferences > General > Security > Secure Storage > Contents > Delete.
In my case I set it to "native" settings where socks was enabled for proxy. (Internet Explorer->Internetoptions->Connections->LAN-Settings->Proxy Settings). After disabling it there and adding the following lines to eclipse.ini everything works well:
-Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclient4
-Dorg.eclipse.ecf.provider.filetransfer.retrieve.closeTimeout=3000
-Dorg.eclipse.ecf.provider.filetransfer.retrieve.readTimeout=3000
In my case the problem started after installing the Spring Tool Suite. Uninstalling it solved the problem.
Version: Kepler Service Release 1
A friend of mine ran into that exact problem (fresh machine with a fresh eclipse Kepler installation, the computer was not behind a firewall or proxy.) It turned out to be an issue with Java 7 update 51, when we used a Java 6 JRE to run eclipse the problem was magically solved.
I had faced the same problem , The issue with my set up was I was using JDK, after repointing to JRE it is working perfectly now. Proxy Setup- Windows->Preferences->General->Network Connections. Active Provider-Native, Just make sure HTTP - Dynamic should be checked, remaining all should be Unchecked.
Note: Above Description Tried and tested with Kepler only.
Another note:
After changing my Windows password, eclipse's Windows-integrated secure storage seemed to have become inaccessible without notice. Apparently this not only made eclipse 'forget' my proxy auth settings but also prevented it from storing the credentials after I set them up again. I could configure them any way I wanted but as soon as I clicked "OK" they were gone again.
The solution for me was to go to General > Security > Secure Storage and click on "Change Password..." for the Windows Integration master password provider. Of course, this wiped all passwords previously stored by eclipse, but it left me with a clean, working Secure Storage and allowed me to successfully set up and store the proxy credentials again.
It happened to me because eclipse was using JRE and not JDK.
To force eclipse to use a given VM, edit
<eclipse_root>\eclipse.ini
and add those 2 lines at the top of the file:
-vm
C:/Program Files/Java/jdk1.6.0_45/bin/javaw.exe
Note: Eclipse using JRE was triggering a:
java.lang.NoClassDefFoundError: javax/net/ssl/SSLSocket
java.lang.NoClassDefFoundError: javax/net/ssl/SSLSocket
at org.apache.http.impl.conn.SchemeRegistryFactory.createDefault(SchemeRegistryFactory.java:45)
at org.apache.http.impl.client.AbstractHttpClient.createClientConnectionManager(AbstractHttpClient.java:294)
at org.apache.http.impl.client.AbstractHttpClient.getConnectionManager(AbstractHttpClient.java:445)
at org.apache.http.impl.client.AbstractHttpClient.createHttpContext(AbstractHttpClient.java:274)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:797)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientFileSystemBrowser.runRequest(HttpClientFileSystemBrowser.java:263)
at org.eclipse.ecf.provider.filetransfer.browse.AbstractFileSystemBrowser$DirectoryJob.run(AbstractFileSystemBrowser.java:69)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
Caused by: java.lang.ClassNotFoundException: javax.net.ssl.SSLSocket cannot be found by org.apache.httpcomponents.httpclient_4.1.3.v201209201135
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:455)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(Unknown Source)
Did you make sure that you selected the Manual mode in the Active Provider section? Go to the Preferences/General/Network Connections menu again and change that if it is not. I think that part is kind a buggy.
I had this issue, and i changed the proxy settings with password in eclipse. go to windows-> preferences-> search for "proxy" open Network connections.
Select Active Provider to Manual. Set HTTP and HTTPS proxy, system username and password. (it was not working without username and password in my machine)
Clear SOCKS proxy if its set.
File-> Restart
来源：https://stackoverflow.com/questions/17338212/eclipse-kepler-not-connecting-to-internet-via-proxy