eclipse and ssh connection refused

Hi,

as usual, i want to use my brand new installation of ubuntu 12.10 to develop web application.

for that i use eclipse platform and remote system plugins (ssh) to reach our ubuntu server (nas) and remote systems.

whereas it works perfectly under windows 7 and fedora 18, i have some trouble under ubuntu 12.10.

i do the same steps as under fedora 18, but when i type user name and password, eclipse display in loop the login window to reach my remote system with ssh (terminal, sftp, or shell)

where is the problem ?
thx