Connection issue with dRuby

I wrote a simple server and client using dRuby.
on client side, I executed about 200 simultaneous instances of client
to see how my server does.
I noticed on client side, I am getting DRb::DRbConnError while server
is still up.
Also I had DRb::DRbConnError when I executed client and server was not
up.

What I am trying to accomplish is to differentiate between this two
types of error.

Would anybody please help?

Thanks,
Mohammad

Am I the first one having this issue?

Mohammad