Question

When I want to update the eclipse I get the following error:

Some sites could not be found. See the error log for more detail.
Unable to connect to repository
http://download.eclipse.org/eclipse/updates/3.7/content.xml Connection
timed out: connect Unable to connect to repository
http://download.eclipse.org/releases/indigo/content.xml Connection
timed out: connect

the available software sites are: http://download.eclipse.org/releases/indigo and
http://download.eclipse.org/eclipse/updates/3.7

The version of eclipse is 3.7.2

Answer 1

I have now set the proxy with

Window -> Preferences then General -> Network Connection 

There I filled in my proxy and now I can update eclipse without any problems.