Thank you Paul Beach & John Bellardo for your useful help.
The solution was to change the entry in inetd.conf file as follows :

gds_db stream tcp nowait root
/appli1/own/usr/interbase/bin/gds_inet_server gds_inet_server -h
/appli1/own/usr/interbase

as explained in the document ibp_50_env_var.html

However, a problem subsist :
There are also 2 other links for gds.a and gdsshr.a from
/appli1/own/usr/interbase/lib to the usr/lib folder. I don't know if
there is a mean to avoid making these links and oblige the server to
check directly in /appli1/own/.../lib, for the same reasons I
mentionned yesterday?

--- In ib-support@y..., "Paul Beach" <pabeach@w...> wrote:
> Try setting the INTERBASE environment variable to point to your new
location
> for InterBase.
>
> Look at http://www.ibphoenix.com/ibp_50_env_var.html
>
> Regards
> Paul Beach
> Main Tel (UK):+44 (0) 1844 354465
> Mobile: (UK): +44 (0) 7764 188603
> http://www.ibphoenix.com
> For all your upto date Firebird and
> InterBase information
> ----- Original Message -----
> From: <ignace.martin@s...>
> To: <ib-support@y...>
> Sent: Tuesday, October 09, 2001 9:05 AM
> Subject: [ib-support] Changing Installation path in AIX without
making a
> link
>
>
> > I am installing Firebird CS 0.9.4 on a AIX 4.3 server.
> > As the Server is clustered, I have to install interbase in the
path
> > /appli1/own/usr/interbase in place of /usr/interbase
> > We have changed the install script to reflect this new path and
added
> > a
> > <<INTERBASE=/appli1/own/usr/interbase>> variable in /etc/profile,
> > /etc/dtprofile .... That works locally : I can open an isql
> > transaction. But
> > I cannot connect remotely from a Winnt workstation via inetd,
getting
> > the
> > error : "cannot find password database".
> > When I create the link /usr/interbase pointing
> > to /appli1/own/usr/interbase,
> > it works! BUT : the system administrator forbid me to place
anything
> > in /usr
> > path...
> > So, here is my question : is there a specific file where I can
define
> > the
> > INTERBASE variable in order to be used by gds_inet_server ?
> >
> > --
> > Ignace Martin
> >
> >
> >
> >
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> >