Error check ESXi Host compliance

[ThomasL1]

Hello Community,

at the ESXi-Hosts in one vsphere Clusters I got an Error when I do a "Compliance Check".
I have only attached the predfined Baselines.

My vCenter Server Appliance is on version 7.0.1.00300 and the ESXi Hosts are on ESXi 7.0.1 Build 16850804 .

In the VUM Log I got the following Error:

<error errorClass="MetadataDownloadError">
<errorCode>4</errorCode>
<errorDesc>Failed to download metadata.</errorDesc>
<url>http://URL-to-vCenter:9084/vum/repository/hostupdate/CIS/CIS-ESXi-7.0-Addon-cumulative_metadata.zip</url>
<localfile>None</localfile>
<msg>('http://URL-to-vCenter:9084/vum/repository/hostupdate/CIS/CIS-ESXi-7.0-Addon-cumulative_metadata.zip', '/tmp/tmp9ri_3blh', '&lt;urlopen error [Errno -3] Temporary failure in name resolution&gt;')</msg>
</error>

I have already checked if the ESXi-Hosts can connect to vCenter via Port 9084. The ESXi-Hosts can connect to the VCSA via Port 9084.

Does anyone have any idea how I could solve the problem?

Thank you in advance for your support.

Moderator edit by wila: Moved to Update Manager discussion area

[harry89 · Accepted solution]

Issue appears to be with name resolution somewhere as per the snippet . 
Disable the firewall for the host and try once 

Also reset vum database can be helpful