My computer located in the the local network area and I use Internet via HTTP proxy server.
Today I found a solution how to configure my JBoss Portal in order to connect it with Internet.
The simplest way is to add specific properties to the JAVA_OPTS variable.
I added one string at the beginning of run.bat file:
set JAVA_OPTS=-Dhttp.proxyHost=<Proxy Host> -Dhttp.proxyPort=<Proxy Port>
In Linux it should be:
JAVA_OPTS="-Dhttp.proxyHost=<Proxy Host> -Dhttp.proxyPort=<Proxy Port>"
You should replace values "Proxy Host" and "Proxy Port" with actual data for your network.
Now all portlets are working and I'm happy.