-24940: ERR_NEEDSYSLOGON - system logon required 

Explanation:

This DBM command requires you to log on to the operating system.

User Response:

Assign an operating system user to the relevant DBM operator. Use the DBM command user  put.

To activate the operating system user, log on to the DBM server again. To do this, use the DBM command user  logon, and note any warnings that are displayed indicating problems with the operating system logon.