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The 4.2.1 release includes fixes for a number of issues; including problems with Xenserver VMSnapshots, UCS rework, Device device ID changes for Xen, Configurable configurable option to choose single Vs multipart upload for S3 API and Allow allow network with public IP Address without needing SourceNAT.
Fixes to documentation, upgrades and more. Please see the <Release Notes> (Final link to be added) file for a full list of corrected issues in this release and upgrade instructions. As a minor release it is a simple upgrade from 4.2.0 with no architectural changes. SystemVMs will require a restart.

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