In January 2019, MS released some updates which blocked SMB access. This post wil lbe out about Windows 7, but there could be other users/OS effected.
The problem update we found and blocked was KB4480970, but also MS says KB4480960 was a problem.
They released a fix for this, by udated later in the month called KB4487345.
This patch got rolled up into the February and then the March Rollups. See KB4486563 and KB4489878 (for March).
A good guide to te issues, and some links to search the MS catalog for standalone patches/updates is:
https://borncity.com/win/2019/01/12/fix-for-the-windows-7-smb-network-bug-caused-by-update-kb4480970-kb4480960/
Other details:
The offending update
https://support.microsoft.com/en-us/help/4480970/windows-7-update-kb4480970
Location to D/L
http://www.catalog.update.microsoft.com/Search.aspx?q=4489878
The Fix
http://www.catalog.update.microsoft.com/Search.aspx?q=KB4487345
March Rollup
https://support.microsoft.com/en-us/help/4489878/windows-7-update-kb4489878
Location to D/L
http://www.catalog.update.microsoft.com/Search.aspx?q=KB4489878
First look writeups of the problem, from borncity
https://borncity.com/win/2019/01/09/netzwerk-issues-with-updates-kb4480970-and-kb4480960/
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