No repository found error in Installing ADT in eclipse Indigo
Uncheck “Contact all update sites during install to find required software” (this is causing the error message above).
Just had the same issue.
I removed the http://dl-ssl.google.com/android/eclipse/site and then re-added it, then everything downloaded fine.
for the latest update, I had to use the url
https://dl-ssl.google.com/android/eclipse/Please note the "https" as well as the "/" at the end of the url.