Strange Bootstrap Error Message

[Till]

Hi All

I have experienced a problem with unsuccessful savegroups from time to time, the message is like this :

*backupserver.domain.com:bootstrap client is no longer in group 'groupname'

Data Volumes of this client, here a virtual node of a Netware 6.5 Cluster are backed up successful but this error causes the group to fail.
Restores are also possible without any problem

The Backupserver runs on Win2K3 Sp1 with Networker 7.22

Thx in advance

Till