i need to unset them. That is currently done in the .desktop file. Before it was done in a shell script. If set neither the launcher nor the client are able to access amazon (port 80 and 443). Also have to open these ports at the firewall. Fiddling around with the proxy (direct, no cache) does not help. On a terminal you can use unset http_proxy https_proxy ftp_proxy no_proxy NO_PROXY prior starting the launcher or client.