When we now load Named on one of our NW65 SP5 boxes we get the following

Starting eDirectory integrated Novell DNS Server...
critical: eDirectory login failed with error -603
critical: Failed to load RRs of a zone with error -603
critical: loading configuration: (result code text not available)
critical: exiting (due to fatal error)
DNS Server is unloaded successfully
DNS Server Exiting

(Press any key to close)

No changes have been made as far as I am aware for it to stop working.
Can anyone tell me what the error means exactly?

Kind regards,