Eclipse behind a corporate proxy

If you're working in a big company, chances are that you are behind a corporate proxy and it can become very annoying because they tend to limit developement tools. As a Java developer, I use Eclipse as my default IDE.

The simplest way

Go to Preferences > General > Network Connections, then in Active Provider choose Manual.
Then enter your proxy address, your port and your username and password.

The hardest way

If you're on Windows and you don't have an explicit username/password couple, then it must be an NTLM proxy, in this case choose Direct in Active Provider then open your eclipse.ini file (configuration file that you can find in your eclipse directory). And add this line :

-vmargs
Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclient4

Restart Eclipse and evertyhing should be working.