I try to install additional plugins in Eclipse Kepler SR2 from Help -> Install New Software menu. I select a site or type filter text,  but nothing happened, the selection window remains blank. Internet works fine on my machine as well as Help -> Eclipse Market Place menu.

Solution: close eclipse, go to eclipse workspace folder and remove the following file:
.metadata/.plugins/org.eclipse.equinox.p2.ui/dialog_settings.xml