eclipse kepler "Cannot install remote marketplace locations"

Question

I have downloaded the latest eclipse version, eclipse kepler.

But when i try to access the Marketplace inside eclipse or try to install ADT plugin for Android, it gives me this creepy error which is driving me crazy:

Cannot open Eclipse Marketplace
Cannot install remote marketplace locations: Connection failed

This is most often caused by a problem with your internet connection. Please check your internet connection and retry.
Unable to read repository at http://marketplace.eclipse.org/catalogs/api/p.
Connection reset
Connection failed

This is most often caused by a problem with your internet connection. Please check your internet connection and retry.
Connection reset

Answer 1

I figured out finally that:

Avira Anti-Virus Software was blocking the network requests by eclipse. After deactivating "enable web protection" in the Anti-Virus, the stupid Eclipse was able to update itself.

Answer 2

please put below line to eclipse.ini in the last it worked for me -Djava.net.preferIPv4Stack=true

Answer 3

If you are sitting behind a corporate network it could be filtering out requests coming from eclipse. Switching to 3G on my phone made it work for me.

Answer 4

This frustrated me for a while before I stumbled upon this link:

https://www.eclipse.org/forums/index.php/t/783720/

It says clear SOCKS entry in Network connections and be in manual Active Provider.

The SOCKS entry was already clear but after clicking on clear again, it just worked so worth a shot.