Github user glennwagner commented on the issue:
https://github.com/apache/cloudstack/pull/1601
LGTM
Testing 4.9 master with pr 1601
1. Original results without PR KVM hosts failing to add , error in logs
were NIO connection errors
2. After the PR was applied all KVM hosts (Ubuntu and CentOS) add correctly
and KVM agents checked in with an UP status
Systems VM's deployed with no errors
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