> It seems that everything hangs when, at some point, a request from
> Jaybird to the firebird instance does not respons. At this moment
> nothing happens any more. The java stuff just keeps waiting for a reply.
> I see no messages on either java or firebird side.

Can you tell in which method this happens? Do you have thread dump?

> Anybody any ideas what could be the problem or how it could be fixed ?

If you have a reproducable test case, please send it to me, I will
investigate it. Also you can try type 2 or embedded JDBC driver, you should
get some exceptions in this case.

Roman