The problem is the <get> task in, I think $FORREST_HOME/main/targets/plugins.xml or so. You can workaround by going to $FORREST_HOME/plugins/org.apache.forrest.plugin.pdf-output and running "ant local-deploy".
Or (if you don't have SVN version of Forrest) you can goto http://forrest.apache.org/plugins and manually donwload the plugin zip file. Extract the zip into forrest_dir/build/plugins
Or, as you suspect you can configure Forrest to run with your proxy, but this is not a FOrrest thing it is a Java/ANT thing.
Ross
