At 09:57 PM 8/02/2006, you wrote:

>Hi to all,
> recently we moved our FirebirdSS 1.5.1 server from RedHat 9b to
>RedHat ES4. After this OS upgrade i've started experiencing some
>trouble in attaching to database
>Sometimes happens that i loose the possibility to attach to the main
>database running on this server. Restarting the machine it seems that
>the problem disappear. We never experienced such problem on the
>previous OS. The only DDL task that the application accessing the db
>does, is to create/drop dinamically some very simple computed fields
>in a couple of tables. But this not happens very often.
>Do you know if there is some compatibility trouble betweeen this
>version of FirebirdSS and RedHat ES4?

Yes, it's a threading incompatibility between Fb 1.5.1 and the New
POSIX Threading Library (NPTL). You need the NPTL build (not
available for Fb 1.5.1). Download the latest release (1.5.3) and
make sure it's the NPTL build you get.

./heLen