"requested target not found" during VSS backup

Hi,

We perform nightly backups using Symantec Backup Exec on about 50 servers connected to an EQL array. ALL of our 2008R2 machines generate following error (of course: I
then metioned iqn names are different for each machine):

http://192.168.40.1/

-----------------------------------------
ERROR event from storage array OUDEQL2
subsystem: MgmtExec
event: 7.4.3
time: Tue Mar 8 23:35:21 2011

iSCSI login to target '192.168.40.1:3260, iqn.2001-05.com.equallogic:0-8a0906-a48491c09-108000270e64d76a-oudnpadm-vol1-2011-03-08-23:14:32.56281' from initiator '192.168.40.109:50370, iqn.1991-05.com.microsoft:oudnpadm.azo.lan' failed for the following reason:
Requested target not found.
-----------------------------------------


If we reboot the machines, the error goes away for a day or 2, then returns. This ONLY happens on 2008R2 machines, and seems to be related to vss backups.

Any idea how we can get rid of this error????