VMware VUM not updating ESX 6.0 hosts

When I scan hosts in VMware Update Manager (VUM), I get an error - "Host cannot download files from VMware vSphere Update Manager patch store.  Check the network connectivity and firewall setup, and check esxupdate logs for details."

The esxupdate log shows that download from http://<vCenterServer-IP>:9084/vum/repository/hostupdate/vmw/vmw-ESXi-6.0.0-metadata.zip fails. I am attaching the log file.

The vCenter server is listening on port 9084. Updates worked fine a few months ago. What may be missing or misconfigured? Thanks.

AK
VUM-Exupdate.log
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AkulshAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Seems like VUM does not have access to the Internet ?

Firewall changed? do you use a proxy ?

if you test VUM internet connection, does it succeed or fail ?

try again in 24 and 48 hours ?
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AkulshAuthor Commented:
By VUM, I think you mean vCenter server since VUM is installed there.
The vCenter server has access to Internet. We don't use proxy and Firewall permits access.
Just now, I went to Admin View of VUM and clicked on Download Now in Config > Download Settings. In Recent Tasks, "Completed" showed up for "Download path definitions".

So I don't think it is an internet connection issue. In fact, I can see all patches listed when I "Stage" a host.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Completed, definitely confirms, you have Internet connection.

are you doing any differently to my EE Article

http://www.experts-exchange.com/articles/19279/HOW-TO-Update-Patch-VMware-ESXi-6-0-0-GA-to-ESXi-6-0-0b-with-VMware-Update-Manager-VUM.html
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AkulshAuthor Commented:
Sorry for late response.

The problem was with port 9084 of vCenter server which was not open from ESX hosts. Now that it is permitted, updates can be done. Thanks.

AK
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AkulshAuthor Commented:
Even though vCenter was listening on port 9084 all along, ESX hosts were not allowed to reach that port. (Firewall group had blocked that port.)
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