Setting up OpenSSH for Windows using public key authentication

Question

I am having issues setting up OpenSSH for Windows, using public key authentication.

I have this working on my local desktop and can ssh with a key from Unix machines

Answer 1

Use this sequence of commands in PowerShell to correct permission of administrators_authorized_keys

$acl = Get-Acl C:\ProgramData\ssh\administrators_authorized_keys
$acl.SetAccessRuleProtection($true, $false)
$administratorsRule = New-Object system.security.accesscontrol.filesystemaccessrule("Administrators","FullControl","Allow")
$systemRule = New-Object system.security.accesscontrol.filesystemaccessrule("SYSTEM","FullControl","Allow")
$acl.SetAccessRule($administratorsRule)
$acl.SetAccessRule($systemRule)
$acl | Set-Acl

Only SYSTEM and Administrators group must be have permission in file without inherited.