DP5.1 and Error [-1003] login has been denied s_nologon

[Dave Showalter]

In the middle of a backup, DP I think was attempting to change tapes, This is all that is showing in the debug log.
Backups ran fine all last week. This is from Sat nites backup run.

I cannot abort or cancel the device.

Omnidbcheck -extended shows all ok.

MSL6030 library.

DP51 Patch levels
Core 206
Cell 207
DA 175
Ma 190
Cell interface 210