We have a client system for which scheduled backups have missed for about a
week. We are seeing groups of activity log messages like the following for
this client:

01/11/2006 10:48:17  ANR0406I Session 8546 started for node PROVIDENCE
                      (Linux86) (Tcp/Ip 10.160.6.19(39376)).
01/11/2006 10:48:17  ANR0423W Session 8546 for administrator + ( ) refused
                      -
                      administrator name not registered.
01/11/2006 10:48:17  ANR0403I Session 8546 ended for node PROVIDENCE
(Linux86).

We normally register nodes with 'user=none', preventing the creation of
administrator accounts associated with specific nodes. Output from 'q admin
f=d' shows no unexpected administrator accounts, no accounts with strange
looking names, and no accounts created around the time backups started
missing.

The server is 5.2.6.0 running under mainframe Linux. The client is an Intel
Linux system with 5.2.3.0 client code and a 2.4.21-20 kernel.