Connection errors after 500 concurrent connections

Hi,

I have a scalability issue with the Qpid C++ broker (version 0.16 on
Debian). At about 500 concurrent connections the new connections are
increasingly rejected with the error "connect() aborted" (this message
comes from the Java client). The connection is closed immediately after
the broker sent the protocol header.

Is this a know limitation of the broker, or is there something I can do
to handle more connections?

Thank you,

Emmanuel Bourg