At 11:50 AM 23/06/2005 +0100, you wrote:

>Any ideas what could be causing this. It's happening intermittantly at a
>client site. FB1.5.2, Red Hat 9
>
>from firebird.log (machine name is ct)
>
>ct (Server) Thu Jun 23 10:33:24 2005
> Fatal lock manager error: invalid lock id (0), errno: 2
>
>ct (Client) Thu Jun 23 10:33:24 2005
> /opt/firebird/bin/fbguard: bin/fbserver terminated abnormally (1)
>
>
>ct (Client) Thu Jun 23 10:33:24 2005
> /opt/firebird/bin/fbguard: guardian starting bin/fbserver

Are you using the NPTL build of Fb 1.5.2 SS? With RH 9 you need to; or
otherwise you need to disable NPTL. Seach the 1.5 releasenotes for 'NPTL'
- it tells you how to disable it.

./heLen