March Patch Tuesday for Windows 7 brought new updates to support the SHA-2 encryption algorithm.
These updates must be installed before the 16 July 2019, on the Windows 7 Service Pack 1 operating systems and on the Windows 2008 R2 Service Pack 1 operating systems before they can receive subsequent updates after that date.
Updates that add SHA-2 support are KB4474419, KB4490628And KB4484071. All these updates should be installed before the above date.
You will find them through Windows Update on all Windows 7 and Windows Server 2008 devices as part of this month's Patch Tuesday. If you don't install them you won't be able to have others security updates since July.
Update KB4474419 introduces SHA-2 support for Windows 7 SP1 and Windows Server 2008 R2 SP1, while KB4490628 is an update that resolves an issue related to this hash algorithm. This technically means Windows Update it will be ready to receive updates signed with SHA-2 algorithm, so your device will complete the downloads and installations of the updates without any problem.
Finally, KB4484071 is an update version which specifically targets the functional Windows Server Update Service 3.0 Service Pack 2 (WSUS).
Company-based updates will be included in the next Patch Tuesday, while Windows users will be able to download and install them manually from the Microsoft Update Catalog.
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