conf/jacorb.properties (which AFAICT comes from the jacorb distribution etc/orb.properties) contains the following settings to control the connection timeouts, commented out:

1. client-side connection idle timeout, set no non-zero to stop
2. close the connection after so many msecs.
   #jacorb.connection.client_idle_timeout=0

1. max time (msecs) a server keeps a connection open if nothing happens
   #jacorb.connection.server_timeout=10000

However, by looking at the jacorb sources, the used property names are different:

org.jacorb.orb.iiop.ClientIIOPConnection
timeout = configuration.getAttributeAsInteger("jacorb.connection.client.idle_timeout",0 );

org.jacorb.orb.iiop.IIOPListener
serverTimeout = configuration.getAttributeAsInteger("jacorb.connection.server.timeout",0);

So this needs to be fixed both in jboss and in jacorb.