This vSphere Upgrade guide is updated with each release of the product or when necessary.

This table provides the update history of the vSphere Upgrade guide.




Updated About the boot.cfg File to add a reference to an example.

Updated vCenter Single Sign-On Deployment Modes and Install an Additional Node for a Multisite vCenter Single Sign-On Installation with the information that high-availability clusters are unsupported in multisite vCenter Single Sign-On deployments.


Updated the first prerequisite in Install or Upgrade the vSphere Web Client to add a link to the topic for downloading the installer.

Updated Step 1 in Update the VMware vCenter Server Appliance from a Zipped Update Bundle and Update the VMware vCenter Server Appliance from the CD-ROM Drive to add information about the download file name.


Updated vSphere Client and vSphere Web Client Software Requirements with current browser support.


Added information about ports 3268 and 3269 in Required Ports for vCenter Server.

Updated Replicate Data Between Multisite Single Sign-On Instances in a New vCenter Server Deployment to correct the order of the steps.


Removed the topic that discusses how to configure Windows NTP Client for Network Clock Synchronization. That information is available from the Microsoft Web site

Updated Synchronizing Clocks on the vSphere Network to include link to Knowledge Base article that includes current time synchronization intervals.

In the topic Upgrade the VMware vCenter Server Appliance, added prerequisite to take snapshot of the existing appliance, and made several updates to procedure steps.

In the topics Install or Upgrade vCenter Single Sign-On for a High Availability Deployment and Install or Upgrade the First Node in a Single Sign-On High Availability Installation, added information about access to vCenter Single Sign-On during upgrade.

In the topic Prerequisites for the vCenter Server Upgrade, in the sections Prerequisites for All vCenter Server Databases and Prerequisites for Microsoft SQL Databases, added text to clarify the prerequisites about removing the DBO role, and migrating all objects in the DBO schema to a custom schema.

Added topic Differences Between vSphere Upgrades and Updates.

Updated the topic Upgrade or Update a Host with Image Profiles to include information on upgrades in addition to updates.

In the topics Update a Host with Individual VIBs and Update ESXi Hosts by Using Zip Files, added note to advise that the esxcli software vib update and esxcli software vib install commands are not supported for upgrade operations.


In the topic vCenter Single Sign-On Deployment Modes, updated information about access from vSphere Web Client and vSphere Client to multisite vCenter Server instances.

In the topic vCenter Server Software Requirements, added information about using the online VMware Compatibility Guide to find compatible host operating system versions for vCenter Server.

In the topic Prerequisites for the vCenter Server Upgrade, added system prerequisites to verify that the NETWORK SERVICE account has read and execute permissions on the folder where the RSA SSPI service is located and read permissions on the folder in which vCenter Server is installed and on the HKLM registry.

In the topic Sample DHCP Configuration, in GPE Example, added missing semicolon to end the line: option gpxe.bus-id code 177 = string;.

In the topic Prerequisites for the vCenter Server Upgrade, added system prerequisite to upgrade version 4.1 ESX/ESXi hosts to version 4.1 Update 1 before upgrading vCenter Server.


Initial release.