is it possible to set a proxy on Rss viewer, as I'm behind a firewall?
If not, this would be a good idea to implement.
It is possible. There are no preferences yet, but you can type:
java -Dhttp.proxyHost=<proxy-host> -Dhttp.proxyPort=<proxy-port> -jar rssview.jar
and similar, if you need ftp-proxies to make the java.net classes use a proxy. This is a workaround for now.
I just filed a bug against the proxy support. It didn't work for me. Could it be because my proxy server requires authenication ?