can not open web client in eclipse

Hello,

i'm using RTC client 5.0.1. i'm running on ubuntu 14.04 (linux).

i installed the plugin on my eclipse (neon) as my developing environment.

i'm connected to my project and my team. when i double click something, the project for example, i have the otion to open in eclise or in the web. if i choose eclipse, then i get the content in a new eclipse tab. if i use we, i get the eclipse internet browser tab and a pop-up of a window askin to download the project (name). if i press yes, i get an empty file. anyway, it doesn't seems to open the link for the web.

even if i bring the link (from another PC where i'm using windows) i get the download pop up. if i paist the link to firefox on my ubuntu, i see no problem and it is open fine.

is anyone knows what could be the problem?