Yesterday I installed the all updates to hosts and Hosted Engine (and now I have oVirt Engine Version: 4.0.3-1.el7.centos)
But the problem still persists.
==>>> Is this happening consistently or randomly?
Consistently. every night.
==>>> Do you have any proxy server defined?
Yes. I add to end of ~/.bash_profile (for root) three lines:
export https_proxy=http://s-MY01-Linux-Upd:Passw0rd@KOM-AD01- GWCLU.holding.com:3128/
export http_proxy=http://s-MY01-Linux-Upd:Passw0rd@KOM-AD01- GWCLU.holding.com:3128/
export ftp_proxy=http://s-MY01-Linux-Upd:Passw0rd@KOM-AD01-GWCLU. holding.com:3128/