Questions tagged [server-message-block]

Server Message Block is a network file sharing protocol created by Microsoft. This is the protocol used for file and printer sharing on Windows networks.

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Samba (SMB1), can't connect via LANMAN1 dialect

I need to get as much pcap as possible for different SMB1 dialects. The client and server are on Linux, via Samba. I connect with the command: smbclient \\\\192.168.0.1\\share -m LANMAN1 And I get ...
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Excel Files keep getting saved as 0 KB on an SMB Share

Our users Excel Files keep getting saved as 0 KB on an SMB Share, it seems like it's a timeout issue, are there any SMB settings that can be changed on the Windows Server service or SMB protocol that ...
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1answer
18 views

Why is file browsing so slow during file upload / saving over VPN?

Working remotely over VPN, when I save a large file to our file server, I am unable to browse any other file shares on the server during that time. Basically, windows explorer hangs up and is stuck, ...
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16 views

Domain Controller DNS alias

I recently updated an old Win2008R2-based domain to a new Win2019-based one (with the common promote / demote / decommission dance). This was for a very small office (3 peoples), so this is a single-...
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61 views

Clear cached authentication for network share

Context: I map a cifs share in windows using NTLMv2 authentication, as the legacy server doesn't support kerberos. I am not prompted for login: net use S: \\server.domain.com\share /persistent:yes The ...
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Inheriting file permissions from directory for SQL user on Ubuntu

I have an application which uses a MSSQL server on Ubuntu and want to be able to copy my backup files to a Windows 10 machine. I'm very familiar with the Windows side, but much less familiar with ...
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16 views

VM acting as a proxy over Azure Files for SMB2 support

Context We're in the process of migrating a number of systems from on-prem to Azure. As part of this, wherever we've got a file share I'm looking to switch to Azure Files, so we can avoid the joys of ...
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31 views

Accessing files using UNC paths over smb without mounting shares?

Is it possible on Linux to access files using UNC paths over SMB protocol without mounting shares first? Linux supports SMB protocol and allows to mount SMB Shares like: mount -t cifs -o username=<...
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What is the equivalent of Get-SMBSession in Windows Server 2008?

What is the equivalent of Get-SMBSession in Windows Server 2008? I am not using Get-SMBSession inside windows Server 2008. thanks,
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1answer
46 views

Why would blocking NetBios packets impact SMB3?

Question Why should NetBios filtering impact SMB3 / the ability to connect to port 445? Context Some users (including myself) were having issues accessing file shares hosted in Azure Files from their ...
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Perfmon suggestion to file transfer latency - multiple little files - possibly related to SMB

I'm running several instances of an windows client application (~200 instances), some instances in Windows 10 Build 1809 machines most of then in Windows Server 2016 Build 1607. All of then need to ...
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Setting Windows share permission to folder without updating subfolder permissions

I have a windows share (hosted on a QNAP NAS) with many files and folders in it. Imagine it like: \\nas\share \folderA \subfolder1 \subfolder2 \subfolder3 ... \...
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SMB connection to MS-DOS server from Windows 10 1809+ fails

We need to interface with a legacy system that run MS DOS 6.22, with a TCP/IP stack and wg1049.exe to create a SMB server (more or less as described on this site). Enabling SMB1.0 on our Windows ...
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How to force client to download files locally over SMB instead of holding the file open

Is there a way client or server side MacOS and Windows. To force a client to download files locally, rather than to hold the file open when being read? Similar to how Chrome OS does this.
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windows server RDP works but c$ shared folder access denied

this might be something simple, but I think I rather ask here. We have some servers in our environment which are in workgroup, they can ping each other, test-wsman is a success, RDP from one to ...
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Why is Windows seeing my NAS as two separate devices (one with FQDN, the other with local name)?

My home LAN has a Windows Active Directory domain, with the DNS name corp.example.com. My Synology NAS has the FQDN nas.corp.example.com.. My Windows 10 desktop has the FQDN cube.corp.example.com.. ...
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38 views

SMB Connection to non-domain server

I have a service that needs to establish a SMB connection to several servers. There is no issue with domain-joined computers using a domain account with access. However, I need it to connect to a few ...
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829 views

Setting up Samba in Docker

I am trying to set up a Samba server in Docker. I tried using dperson/samba image from docker hub at https://hub.docker.com/r/dperson/samba. I followed the instructions and tried to connect to it ...
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NETLOGON: What is I_NetLogonGetAuthData

We just started running NETLOGON logs as we believe that there is an issue with the DC connection and we are seeing a lot of the following in the netlogon.log: [SESSION] [1244] I_NetLogonGetAuthData ...
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30 views

Kerberos using JAAS and SMB protocol

We are using JAAS for Kerberos authentication. As a requirement from the customer, we want to make sure that SMB V2 or higher must be used during communication with KDC/AD. I've few basic questions ...
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72 views

Local ethernet file transfers slower than internet downloads

I have an SSD drive connected to my router's USB 3.0 port. My computer is connected to the routeur directly through ethernet (no switch) and runs Windows 10. When downloading files from the internet ...
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2answers
302 views

Windows Server 2019 LMHOSTS File Does Not Work

I am trying to use the hosts/lmhosts files to create various aliases on my new Windows 2019 Server. It is on a corporate Active Directory Domain. "Use LMHOSTS" is checked in the TCP/IP ...
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100 views

Disabling NetBIOS for Samba SMB2

I need to get a pcap for SMB2, but without using NetBIOS as a transport (Direct TCP connection). I did disable netbios on server and client. Both sides on Linux. [global] ... min protocol = SMB3 ...
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63 views

Pointers Finding WHAT IS CAUSING “NT Status: STATUS_SHARING_VIOLATION (0xc0000043)”

Im after some pointers on how i can find what process / application / what ever is causing a "file is currently read only" on client computers. currently im at a wire shark filter "smb2....
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28 views

how do ActiveDirectory, WMI, SMB, et al all fit together?

I am studying for the OSCP exam and am getting lost in the rabbit hole that is Windows network technologies. I understand that ActiveDirectory is a Directory Service that implements LDAP expose ...
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83 views

Slow SMB file transfers over the Internet while using USB-C

we are having an issue with slow SMB file transfer speeds over the internet when using a USB-C connected network device. Setup in use: We are using Lenovo Carbon X1 laptops connected via USB-C to a ...
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71 views

Windows server 2019 super slow read-access to smb shares

Trying to resolve the problem with SMB shares on 2019 Server. The upload speed is perfect, but when I try to open directories, it may stuck, opening file of 100kb size may take a minute. This persists ...
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1answer
37 views

Problems accessing shared folder in Windows clustered file Server 2008 R2

Firs of all I need to apologise for my poor technical and language skills. I will try to describe a problem as detail as I can. There is subnet 172.16.10.0/24 In this subnet I have 3 servers 1 storage ...
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1answer
24 views

Windows server SMB instances

Is it possible to setup 2 instances of SMB with build-in Windows SMB? For example: folders A, B, C and D are need to be shared. Server has 2 NICs. Is it possible to do that folder A and B is ...
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84 views

file shared on SMB on zfs on linux cannot be read over network

The file can be opened locally. I think the problem is related to attributes or permissions somehow, but I do not know how to check them. The files are GoPro videos in a particular directory, and ...
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1answer
121 views

SMB file access behind NAT policy in firewall

I've got an file server behind a firewall (different network from my production network), so my computers are reaching files using a NAT policy in my Firewall. My users are having troubles and lost ...
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74 views

Missing Admin Shares on Windows Server 2012R2 and Server 2019

I was troubleshooting network scan credential failures and noticed that, for some reason, the "Admin" shares on my servers were now MIA. My servers don't typically have a remote drive mapped,...
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37 views

Office files taking more than 30 seconds to load from network shares

Office files (Excel, Word etc.) have recently started taking 30 seconds + the normal load time to run from our file shares. We have it on several servers with 2012R2, 2016, 2019. We've also set up a ...
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178 views

Azure SMB File Share Permission Denied

We have an SMB share set up in Azure. Our infrastructure has an on-prem AD which synchronises with Azure AD and then there is an AADDS domain within Azure which has a copy of the user accounts. If I ...
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44 views

Performance between different SMB/CIFS versions

I couldn't seem to find a lot in searches about the performance difference between samba versions. Obviously, security has been improved, but what about performance?
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1answer
161 views

Event 1007: The share denied anonymous access to the client

the body of evevnt is: " **The share denied anonymous access to the client. Client Name: \10.139.70.35 Client Address: 10.139.70.35:49157 Share Name: \*\in Share Path: ??\C:\Users\jodat\Desktop\...
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36 views

In what order to executable files get transferred and executed from a network share?

What is the difference between transferring an executable file to your local computer before running it vs directly running it from an SMB share. Does running it from the share transfer the whole file ...
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287 views

multiple robocopy calls in one .bat file won't run

I'm trying to backup some files from my Windows server to an external USB drive using robocopy. Running robocopy tasks in cmd works fine but in the .bat it won't run and instead just echoes the ...
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30 views

How should I block traffic to destination port using iptables?

I have received an abuse from my server provider and one thing which is the same is that the target on destination IPs is the SMB (445) port . How can I block destination traffic to port 445 using ...
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217 views

Error Uninstall SMB1

I tried to execute this command in powershell Uninstall-WindowsFeature -Name FS-SMB1 -Remove but encountered error message Uninstall-WindowsFeature: The request to add or remove features on the ...
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565 views

Azure Premium File Share slow over SMB

I m trying to use Azure Premium Azure file share as a mounted drive with SMB 3.0 on windows 10. But the performance are not that great, the upload is around 55mb/s and the download is around 20mb/s ...
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70 views

How can we use LDAP to authenticate SMB share in FreeNAS?

SMB service has been enabled, I can share using freeNAS created users to authenticate SMB share. But how can we use LDAP to authenticate SMB shares? Current LDAP configuration in running on different ...
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logfile on azure share cannot be deleted

I have mounted an azure fileshare on my local machine (ubuntu) and deleted a bunch of files. But some of the files I cannot delete e.g. from the mounted folder: $ ls -la total 1 drwxr-xr-x 2 root root ...
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25 views

Windows file share seems to change the network interface even though connecting via ip

Between two windows servers, I have a connection to the standard LAN (which is the default gateway) on the 10.0.0.0/24 network, I also have a direct connection between the two servers which is on its ...
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39 views

Two Debian Servers, one mounts CIFs the other won't

I can't figure out what the issue is with my /etc/fstab mounting options. I'm migrating from Airsonic to Lightweight Media Server, part of that migration includes adding a SAMBA share to LMS that ...
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1answer
112 views

NAS drive mounted RW (in Linux) but some subdirectories are read-only

I'm mounting a set of NAS drives on my Linux box (Ubuntu 20.04) and everything seems to be working fine for most of the drives: sudo mount -t cifs //mynas/mydrive /mnt/mydrive -o \ credentials=/...
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323 views

Access Based Enumeration with Azure Files

Is it possible to enable Access Based Enumeration in Azure Files? We're using Azure Files with the AADDS integration enabled (per the setup discussed here - though with just the Azure Files; no local ...
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512 views

Why isn't SMB Direct working over RDMA?

In a Windows lab environment, I'm trying to test performance of SMB Direct using Mellanox RDMA adapters with global pause. I wanted to test first with Global Pause for simplicity before switching to ...
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2k views

Windows 10 asking for credentials for SMB Share when accessed via IP, but not when accessed via DNS hostname

Summary I have an SMB share on a domain-joined Synology DS416 NAS. A single computer on our network as a strange issue where the user groupuser can access the share via hostname \\group_nas\share ...
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3k views

Access SMB over a custom port

I have the fileserver hosted on AWS. I was using smb port 445 to access the fileserver. I found out that some ISPs have blocked port 445, so I set up my fileserver instance behind AWS network load ...

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