Unable to read repository at https://ecd-plugin.github.io/update/content.xml in Eclipse - eclipse

I am trying to install decompiler in Eclipse Mars but I am getting Unable to read repository at https://ecd-plugin.github.io/update/content.xml everytime. I tried to install any other plugins too from the marketplace but I got same error. Also i tried to access the url from Eclipse Internal Web Browser and I am able to access the page. Not sure why i am getting this error.Any help or suggestion will be appreciated. Thanks.

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Getting error during Natural plugin installation by using URL in eclipse

First I tried from eclipse marketplace but not able to install the plugin. Then I tried it by using URL these two URL:
http://rlogiacco.github.com/Natural
http://rlogiacco.github.io/Natural
but neither worked. Getting below error with both the URLs
Please help. Thanks in advance.

AWS Toolkit for Eclipse Luna 4.4.1 does not install

I have Eclipse Luna 4.4.1. While trying to install AWS Toolkit from the url, http://aws.amazon.com/eclipse or from Eclipse marketplace url https://marketplace.eclipse.org/content/aws-toolkit-eclipse#group-external-install-button (using drag and drop button), following error happens,
Unable to read repository at http://aws.amazon.com/eclipse/site.xml/content.xml.
Unable to read repository at http://aws.amazon.com/eclipse/site.xml/content.xml.
peer not authenticated
Sometimes it lists down the components available for install but everytime it fails with above error. One thing I noticed is content.xml urls does not seem to be valid or are being interpreted as a invalid URL.
Request help.
Regards
An incorrect URL is specified for the Eclipse Marketplace item AWS Toolkit for Eclipse (the URL should not end with site.xml).
Instead of using drag and drop, you have to use Help > Install with the correct URL http://aws.amazon.com/eclipse/

Unable to load server class 'com.google.appengine.tools.development.gwt.AppEngineLauncher'

I am using Google Plugin for eclipse to develop website using GWT. Every thing work properly before. Today I installed a theme plugin for eclipse and i uninstall this theme plugin after that. When i run my gwt project I get the error
Unable to load server class 'com.google.appengine.tools.development.gwt.AppEngineLauncher'
java.lang.ClassNotFoundException: com.google.appengine.tools.development.gwt.AppEngineLauncher
I have tried reinstall Google Plugin for Eclipse and i still get this error.
How to solve this error ? Thank for any help.
I have tried reinstall eclipse and the Google Plugin. Everything work ok.

Unable to contact Juno download site

I am trying to download m2e for Eclipse Juno but for some reasons I have problems contacting the update site.
I was not able to download from the marketplace, which claimed dependencies are missing.
Then I tried to use the Juno update site (under install new software...) but received this error :
Unable to read repository at http://download.eclipse.org/releases/juno/.
Unable to read repository at http://download.eclipse.org/releases/juno/.
No repository found at http://download.eclipse.org/releases/juno/201209280900.
What is the solution?
The solution I found was to a use the site shown in the error with the addition of '/'
http://download.eclipse.org/releases/juno/201209280900/

Unable to install google plugin for eclipse indigo

I'm setting up eclipse indigo for developing gwt application. But I can't be continue when I got an error message while adding update site http://dl.google.com/eclipse/plugin/3.7 in eclipse. It showed me "could not find http://dl.google.com/eclipse/plugin/3.7". My error was captured and can bee seen at http://i.stack.imgur.com/4mgAr.png.
I have no idea what's wrong. I'm just simply following the instructions at https://developers.google.com/eclipse/docs/install-eclipse-3.7.
I know I can download the plugins separately from https://developers.google.com/eclipse/docs/install-from-zip. But I have no permission to download it.
I'm using ubuntu 11.10 32bit and jdk 1.6.0_23.
Thanks for your help.
Please check your proxy entries of eclipse preferences. (window -> preferences -> General -> Network connections )
I am also facing the same problem while installing the GWT plugin. I have removed the proxy and tried to install the plugin. For that I have removed the laptop from my network connection and accessing the internet from other device(datacard) and tried...Yes installed successfully.
You can use the same link for INDIGO.