>In my windows server 2016 I launch powershell and I write
>
>get-smbclientconfiguration
>
>I'm doing this because I want to see the values for
>
>DirectoryCacheLifetime
>FileInfoCacheLifetime
>FileNotFoundCacheLifetime
>
>I see the values which are not 0
>
>I don't understand that I see their values here but there are no entries associated with those keys when I do a regedit and the I look to find those keys in
>
>HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanWorkstation\Parameters
>
>Why?

The ones we look for are:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\Smb1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\Smb2
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\EnableOplocks
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MRXSmb\Parameters\OplocksDisabled
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\UseOpportunisticLocking
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\parameters\DirectoryCacheLifetime
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\parameters\FileInfoCacheLifetime
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\parameters\FileNotFoundCacheLifetime

If the keys don't exist, Windows uses internal values baked into the DLLs and kernel.

We also gather this information:

!MSINFO32.EXE /report sysinfo.txt

You can search sysinfo for some keywords of interest. In any event, it's a good thing to gather that information and use it for later comparison if the machine ever starts having odd issues show up that are unique to the user account / machine.