Windows 10: My W10 PC is sending anonymous / unauthenticated SMB networks requests

Discus and support My W10 PC is sending anonymous / unauthenticated SMB networks requests in Windows 10 Network and Sharing to solve the problem; Hello, I have reinstalled Windows 10 Pro 2004 on my desktop last week and discovered an issue: it is sending unauthenticated / anonymous SMB requests... Discussion in 'Windows 10 Network and Sharing' started by olivercervera, Sep 14, 2020.

  1. My W10 PC is sending anonymous / unauthenticated SMB networks requests


    Hello,

    I have reinstalled Windows 10 Pro 2004 on my desktop last week and discovered an issue: it is sending unauthenticated / anonymous SMB requests to my server.

    My linux Linux server exposes shares over Samba which is obviously configured to accept only authentication and deny access to guest users. According tothis article, Windows 10 should not send unauthenticated GUEST requests.

    My workflow is the following: I open File Explorer, my server appears in "Network", If I open it I am asked to authenticate and I save credentials, I authN successfully and I can browse folders. I mount the folders I want as network drives.

    Everything seems to work fine, but after few seconds I am browsing folders my server is flooded by errors and Windows Event Viewer logs errors under SMB-Client.

    Here's Windows logs. As you might see there are thousands of errors just made in a week.
    Sorry, my OS is set to Italian, the error says:


    Error: {Access Denied}

    A process has requested access to an object, but has not been granted those access rights.



    Path: \nas\data


    Error code: 31010

    My W10 PC is sending anonymous / unauthenticated SMB networks requests 6a422593-7550-4b52-a24a-3ec53a617f63?upload=true.jpg



    I want to highlight:
    - These errors are made while I can browse and use SMB without issues

    - These errors are not logged when using another PC or VM, I have tested with both.

    - There's no difference if I mount or not the folder as a share


    Server SMB side here's what I get with verbose logging.


    Mapping user []\[] from workstation

    attempting to make a user_info for
    made a user_info for
    check_ntlm_password: Checking password for unmapped user []\[]@[PC-OLIVER] with the new password interface
    check_ntlm_password: mapped user is: []\[]@[PC-OLIVER]
    auth_check_ntlm_password: anonymous authentication for user [] succeeded
    Auth: [SMB2,null] user []\[] at [Thu, 10 Sep 2020 19:47:59.018110 CEST] with [null] status [NT_STATUS_OK] workstation [PC-OLIVER] remote host [ipv4:192.168.0.100:49239] became [NAS]\[nobody] [S-1-5-21-1308971618-3954224730-4125826118-501]. local host [ipv4:192.168.0.101:445]
    check_ntlm_password: guest authentication for user [] -> [] -> [nobody] succeeded

    Successful AuthZ: [SMB2,NTLMSSP] user [NT AUTHORITY]\[ANONYMOUS LOGON] [S-1-5-7] at [Thu, 10 Sep 2020 19:47:59.018445 CEST] Remote host [ipv4:192.168.0.100:49239] local host [ipv4:192.168.0.101:445]



    At the same time these logs record the correct authN with the right user I saved in Credentials Manager.

    NON verbose logs say:

    create_connection_session_info: guest user from session setup not permitted to access this share data

    create_connection_session_info failed: NT_STATUS_ACCESS_DENIED



    I also turned on Wireshark and confirmed that my PC is indeed sending empty AuthN requests:
    My W10 PC is sending anonymous / unauthenticated SMB networks requests c24fd1d4-0f63-40ec-b1df-d5d6ca76e0a0?upload=true.jpg

    I tried to edit settings that are already enabled by default and should not allow anonymous requests over the network.
    secpol.msc > local policies > security options:
    - Network access: do not allow anonymous enumeration of SAM accounts: ENABLED
    - Network access: do not allow anonymous enumeration of SAM accounts and shares: ENABLED


    I also tried deleting credentials from Crential Manager, removing all shares with the command

    net use */Delete

    and then using something like

    net use z: \\servername\path /USER:username


    I've exhausted troubleshooting steps hence I am seeking for your expertise!

    :)
     
    olivercervera, Sep 14, 2020
    #1
  2. Bree Win User

    Which SMB is on my Network

    To do that in an admin Powershell session use Get-SmbConnection

    Or you can use powershell Get-SmbConnection in a Command Prompt (Admin). Here is a mixed network, my BT router is on SMB 1.5, a W7 machine is using 2.1, while the W10 machines are all 3.1.1. NB: you have to be connected to a machine for it to appear in the list. A File Explorer window looking at the list of shares on a network PC is sufficient, so open File Explorer at Network then open each PC you see there in a new window.


    My W10 PC is sending anonymous / unauthenticated SMB networks requests [​IMG]
     
  3. Kbird Win User
    Which SMB is on my Network

    Hi Bree, can you think of any reason why neither of these commands would work on my system? ( on .557 ). there is no error or anything it simply goes back to the Prompt.

    Get-SmbServerConfiguration works but not either one above.

    KB

    .
     
    Kbird, Sep 14, 2020
    #3
  4. My W10 PC is sending anonymous / unauthenticated SMB networks requests

    Sending anonymous text messages from an N8

    The ability to send anonymous SMS from a mobile phone (using your own sim) is not a phone feature. Unlike caller ID which you can control only the network can control the caller ID on SMS messages.

    You will need to contact your network and ask them if they offer such a service, many do not.

    Another method you could consider is find a website that allows anonymous SMS to be sent then use that site on the phones web browser.
     
    psychomania---01, Sep 14, 2020
    #4
Thema:

My W10 PC is sending anonymous / unauthenticated SMB networks requests

Loading...
  1. My W10 PC is sending anonymous / unauthenticated SMB networks requests - Similar Threads - W10 sending anonymous

  2. Unable to send a request.

    in Windows 10 Gaming
    Unable to send a request.: Any time I try to send a request for more time. It says something went wrong. We were unable to send your request. Are you connected to the internet? For your information I am connected to the internet. And every other device in the house is working. Nothing I do seems to...
  3. Unable to send a request.

    in Windows 10 Software and Apps
    Unable to send a request.: Any time I try to send a request for more time. It says something went wrong. We were unable to send your request. Are you connected to the internet? For your information I am connected to the internet. And every other device in the house is working. Nothing I do seems to...
  4. Unable to send a request.

    in Windows Hello & Lockscreen
    Unable to send a request.: Any time I try to send a request for more time. It says something went wrong. We were unable to send your request. Are you connected to the internet? For your information I am connected to the internet. And every other device in the house is working. Nothing I do seems to...
  5. Hacked PC ANONYM - C:\Program...

    in Windows 10 Gaming
    Hacked PC ANONYM - C:\Program...: Some other Useres are Logged in i think i found this Randomly on My Computer ANONYMUS LOGIN i dont know who that User Is or is it just a Default Microsoft thing.... i really think myComputer has been Hacked.I think its a virus on this Windows app : Can somebody help me i...
  6. PC not visible in W10 network

    in Windows 10 Gaming
    PC not visible in W10 network: I have 2 PCs on my home network, call them A & B. On PC A under network in Windows Explorer both PCs are visible and A can access shared folders on B. On PC B under network in Windows Explorer only B is visible and A is not visible. A had a recent reinstall of W10.I have done...
  7. PC not visible in W10 network

    in Windows 10 Software and Apps
    PC not visible in W10 network: I have 2 PCs on my home network, call them A & B. On PC A under network in Windows Explorer both PCs are visible and A can access shared folders on B. On PC B under network in Windows Explorer only B is visible and A is not visible. A had a recent reinstall of W10.I have done...
  8. PC not visible in W10 network

    in Windows 10 Network and Sharing
    PC not visible in W10 network: I have 2 PCs on my home network, call them A & B. On PC A under network in Windows Explorer both PCs are visible and A can access shared folders on B. On PC B under network in Windows Explorer only B is visible and A is not visible. A had a recent reinstall of W10.I have done...
  9. Send A Request

    in User Accounts and Family Safety
    Send A Request: This used to work. It would enable them to send an email and I could remotely give more time. Now child using computer runs out of time so wants more of course, clicks on send request but gets "something went wrong we were unable to send your request. are you connected to...
  10. Which SMB is on my Network

    in Windows 10 Network and Sharing
    Which SMB is on my Network: Well, trying to get more organized today. For the life of me I cannot find the website that had a command so that one could see a list of all computers on the network and which SMB version they were using. Does anyone know the command? I wanted to see and make sure that all...