Thanks for your answer, mr.Wiser!
My internet daemon is inetd, not xinetd.
I fixed the problem.
I decreased the number of buffer of the database, which Firebird uses
for caching.
As far as I know, Linux caches the file system in RAM.
Does this setting(number of buffers) take effect under Linux or *BSD?

Best Regards
Ivan

--- In firebird-support@yahoogroups.com, Steve Wiser <steve@...> wrote:
>
> Since you are using Classic now instead of SuperServer verify that your
> xinetd settings are not artificially limiting your max number of
> connections:
>
> 1) in /etc/xinetd.d/firebird make sure your instances is set to
> UNLIMITED (or some high number)
> 2) in /etc/xinetd.conf make sure your instances value there is changed
> as well
> 3) in /etc/xinetd.conf make sure your cps setting is increased as this
> is the throttle for accepting new connections
>
> -steve
>
> Ivan Maradzhiyski wrote:
> >
> > Hello to everyone.
> > We've installed FirebirdCS 2.0.3 on Slackware 10.1
> > Our client applications use several DB connections to a single
database.
> > When there is a number of connections(about 70), the
> > next-trying-to-logon-client is dropped with "Error reading data from
> > connection".
> > We used FirebirdSS 2.0.3 before and there weren't such problems.
> > The server log:
> > dbserver_pld Tue Nov 27 13:53:00 2007
> > INET/inet_error: read errno = 104
> >
> > dbserver_pld Tue Nov 27 13:53:00 2007
> > INET/inet_error: read errno = 104
> >
> > dbserver_pld Tue Nov 27 13:53:00 2007
> > INET/inet_error: read errno = 104
> >
> > dbserver_pld Tue Nov 27 13:53:01 2007
> > INET/inet_error: read errno = 104
> >
> > dbserver_pld Tue Nov 27 13:53:01 2007
> > INET/inet_error: read errno = 104
> >
> > dbserver_pld Tue Nov 27 13:53:01 2007
> > INET/inet_error: read errno = 104
> >
> > dbserver_pld Tue Nov 27 13:53:01 2007
> > INET/inet_error: read errno = 104
> >
> > dbserver_pld Tue Nov 27 13:53:01 2007
> > INET/inet_error: read errno = 104
> >
> > We do not use aliases, everything is set correct. Client machines are
> > MS Windows 2000/xp.
> >
> >
>