6.5.1

Table Of Contents
Best Practices Involving Multiple
vSphere Components 9
Some security best practices, such as setting up NTP in your environment, affect more than one vSphere
component. Consider these recommendations when configuring your environment.
See Chapter 3 Securing ESXi Hosts and Chapter 5 Securing Virtual Machines for related information.
This section includes the following topics:
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Synchronizing Clocks on the vSphere Network
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Storage Security Best Practices
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Verify That Sending Host Performance Data to Guests is Disabled
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Setting Timeouts for the ESXi Shell and vSphere Web Client
Synchronizing Clocks on the vSphere Network
Verify that all components on the vSphere network have their clocks synchronized. If the clocks on the
machines in your vSphere network are not synchronized, SSL certificates, which are time-sensitive, might
not be recognized as valid in communications between network machines.
Unsynchronized clocks can result in authentication problems, which can cause the installation to fail or
prevent the vCenter Server Appliance vpxd service from starting.
Verify that any Windows host machine on which vCenter Server runs is synchronized with the Network
Time Server (NTP) server. See the Knowledge Base article http://kb.vmware.com/kb/1318.
To synchronize ESXi clocks with an NTP server, you can use the VMware Host Client. For information
about editing the time configuration of an ESXi host, see vSphere Single Host Management.
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Synchronize ESXi Clocks with a Network Time Server
Before you install vCenter Server or deploy the vCenter Server Appliance, make sure all machines
on your vSphere network have their clocks synchronized.
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Configuring Time Synchronization Settings in the vCenter Server Appliance
You can change the time synchronization settings in the vCenter Server Appliance after deployment.
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