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I currently try to figure out why the following command to access my Windows 10 Pwo (Version 1607) "server" fails when executed from a Windows 7 Pro workstation, whereas it works when executed from another Windows 10 Pro Workstation as a client:

net use q: \\win10test\c$ /user:win10test\myadmin

The details: win10test is the "server" which has Admin shares enabled. myadmin is a local user that has administrative privileges. Also, UAC is completely disabled on the server. In addition, the registry key to fix the wellknown UAC remote restrictions is set as follows:

Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
\Policies\System\LocalAccountTokenFilterPolicy = 1 (REG_DWORD (32-bit))

What I also tried is to enable or disable the different SMB versions, currently SMBV1 and V2/3 are enabled on both clients as well as servers.

All my clients that I try to connect to the Windows 10 server are located in the same local subnet. What I observe now is the following behaviour:

  • every Windows 10 client (I have multiple test systems in my network) can access the "server" using the net use command without any problems.

  • every Windows 7 client fails with the following message:

    System error 5 has occurred. - Access is denied.

I do not have a good explanation for this behaviour. Can anybody provide more hints what to try?

Another hint: Currently, I observe this behaviour only in the Windows 10 1607 LTSB version, but I am not really sure if that si the culprit.

  • Have you tried using Wireshark on one of the machines to find out which protocol the two machines have negotiated? Windows machines should try to use the best so V1 will not be used (and it should be disabled anyway since it is vulnerable), and I think Windows 7 doesn't support SMBv3, so they should negotiate an SMBv2 session, however, Windows 10 will only use SMBv3 if you have SMB Encryption enabled. – Fahad Alduraibi Dec 3 '18 at 11:45

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