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EPM 11.0.1000.1375 -- Account launching LiveUpdate is not a logged in user's account

Created: 01 Feb 2008 • Updated: 02 Mar 2009
Hi again!
During client machine LU request from EPMC in LU log appear error "Account launching LiveUpdate is not a logged in user's account" and no LU is performed. LU is trying to access Symantec Web site.
I suppose there must be a way to update def's via System account automatically?
Any ideas?
When I launch LU with logged in user rights ... anything beside Proactive Threat Protection is updated OK.
Alar.