> I installed FirebirdSS-1.5.1.4481-0.i686.nptl.tar.gz
> and it began working ok.
> I use connection string without server/port part.

That was most likely the reason. I suspect that fb_inet_server is not
designed to be started as a standalone service like the SS one. It has the
"x" attribute on the filesystem, but it works only with inetd.

As I said before, if you use connection string without server/port, you do
not test whether your server works, it does not use network sockets, but the
IPC and successfull connect simply means that the isql can access the
database, it does not tell anything about other clients. It will work even
if you configure your firewall/packet filter to drop every packet, but the
type 4 JDBC driver won't.

Roman