question about nsconnection

[reussandras]

i am trying to implement a client-server thing.
in server, i create a connection with registered name.
in the client, i create a proxyconnection to the
server.
at first run, every thing is ok.
but at the second, i got the following message:
nsgeneralexception: trying to communicate an
invalid proxy
request a NSConnectionDidDieNotification and
release all object to the proxy.

It seem I forget something, but I am unable to
debug my code.
Could somebody give me a clue?
andras