The OES 23.4 updated ISO includes the following defect fixes:
Firewall: After upgrading from the earlier OES versions to OES 23.4, the firewall is enabled by default.
Firewall ports: After upgrading from the earlier OES version to OES 23.4, the firewall ports are disabled by default.
SUSE Xen Hypervisor: Upgrading from the earlier OES versions to OES 23.4 in a SUSE Xen Hypervisor environment results in eDirectory failure.
Splitlock: The splitlock detect is enabled by default which can result in cluster crash during cluster resource migration or while making clusters online.
DSFW server error: Upgrading from the earlier OES versions to OES 23.4 fails, when the eDirectory tree administrator password is not the same as the domain administrator password.