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+issue was:
+net share from Windows 10 to windows XP failed to work, out of the blue
+
+
+
+
+
+two ways to solve this:
+
+
+via gui:
+control panel - add remove programs - add remove windows features 
+(note that win server puts the add remove windows features in that server gui page)
+
+enable this and the two children
+SMB 1.0/CIFS File Sharing Support
+ - SMB 1.0/CIFS Client
+ - SMB 1.0/CIFS Server
+
+
+via cmd line:
+
+Set-SmbServerConfiguration -EnableSMB1Protocol $false
+
+
+of interest to note is that WinXP suddenly stopped being able to see the share
+no immediate / visible error message that indicated the root of the problem
+
+based on my knowledge and experience, I was able to determine the SMB1.0 resolution.
+
+
+
+
+