nmda unable to verify caller privileges: Timed out

Hello all,

we are facing errors like this from time to time on different Oracle servers. The backup itself succeds, but the workflow fails with this error. It happens during Oracle backup with NMDA. The backup runs hourly. Once it fails, the next time it succeedes. There are about 70 clients in the group. I can't believe that this only a time out issue on NetWorker site, but I can't explain the behaviour. Additionally there are no helpful entries in other logs. Any ideas for this?

Recovery Manager complete.
RMAN returned success.
WARNING: The savegrp summary could not be obtained.Unable to query save sets by range: Unable to query save sets by range: Unable to verify caller privileges: Timed out

--- Job Indications ---
Unable to query save sets by range: Unable to query save sets by range: Unable to verify caller privileges: Timed out

NW 19.3.0.2 and primarly Oracle 12 and 19

Thanks a lot in advance