This article provides best practices for upgrading to the latest version of Symantec Endpoint Protection (SEP) 12.1.x. Note: For more information on upgrading to version 14, see Upgrade best practices for Endpoint Protection 14.The following resources will help to plan and perform an optimal upgrade from previous versions of Symantec Endpoint Protection (SEP) to the current version, while following the recommended best practices and being aware of any potential issues and risks.
For a successful Symantec Endpoint Protection Manager upgrade, free space should be at least three times the size of the database.
Consult system requirements for the free space required to install the Symantec Endpoint Protection client.
Here are the recommended methods for uninstalling the Symantec Endpoint Protection client.
Ensure that there is enough disk space to perform the upgrade.
See Required exclusions for proxy servers to allow Symantec Endpoint Protection to connect to Symantec reputation and licensing servers Excluding a trusted web domain from scans.