On Tuesday, 3 January 2012 13:13:55 Götz Reinicke wrote:

Hi,

we do run an Red Hat EL 6.x server with the openldap package from Red Hat currently version 2.4.19-15.el6_0.2. The ldap is used by our mail and fileserver for authentication.

The last time I updated I had a big problem with the deamon crashing after some time.

That problem should be solved now in the recent version 2.4.23-20.el6.

My question:

Could I 'mix' the installed version for now, meaning leave the ldap clients at the current installed version .19 and only update the server first to version .23

Yes.

or should / do I have to update all systems to the same version?

Well, you really should apply updates to your client systems at some stage, but it need not be done simultaneously or as a prerequisite.

Regards, Buchan