Github user milamberspace commented on the issue:
https://github.com/apache/cloudstack/pull/1610
@rhtyd I've tested with a Ubuntu 14.04 / CS 4.7.1->4.9.0 (on virtual
CS-over-CS): works fine.
But with a Ubuntu 14.04 from CS 4.4.0->4.5.1->4.7.0->4.7.1->4.9.0 (real
machines): found this issue.
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