Thanks for your comment. It still doesn't work after fixing that typo though, as neither of "jnp.socketFactory", "jnp.timeout" or "jnp.sotimeout" are used when invoking the naming server. These properties only configure the sockets used to retrieve the stub that is used to invoke the naming server. All the configuration of the stub itself is done on the server and it doesn't seem to be any way of configuring that.