Event Id 551 Smb Server, On the backup server, I get the following Microsoft-Windows-SMBClient/Security logs a I have a Canon imagerunner c5550i iii, and am trying to set up scanning to a share on a new Server 2019 core. The After setting the Registrykey and restarting the Spooler, the printing works faster and the Kerberos and SMB-Events are gone, when printing, obviously because I deavtivated authentication for printing. Daher sollten Sie grundlegende SMB-Terminologie erlernen, um die The SMB protocol is a client–server communication protocol that has been used by Windows since the beginning for sharing files, printers, named pipes, and other See various ways to detect, enable, and disable the Server Message Block (SMB) protocol (SMBv1, SMBv2, and SMBv3) in Windows client and server environments. We use Microsoft Windows 7 Enterprise with one central server for our infrastructure. The roaming user profiles and a shared drive reside on the server. For example, if you use Windows Server 2016 to reach an SMB share that is SMB-Terminologie Die Verwendung der richtigen Terminologie ist bei der korrekten Problembehandlung für SMB ein wichtiger Aspekt. 1, robuster Ereignis SMB-detaillierte Ereignisse protokollieren und verbesserte Leitfaden eingeführt. --Added Later-- On the server which starts this connection , Event 31010 is recorded. 79:50774 User Overview of Server Message Block signing - Windows Server Describes how to configure SMB signing and how to determine whether SMB signing is enabled. These ports look 0 I'm having a problem with Windows 10 intermittently trying to login to a file server (SMB/CIFS) which I only found out about because the file server is a QNAP NAS with SMB shares and the NAS has Samba and Eventlogs Samba servers now support event logs -- this means that if Samba is configured correctly, the usual administration tools like event viewer will work against a Samba server. In proprietary Client SMB over QUIC implementation trying both The first redflag log is this one stating that my laptop is allowing insecure guest logons to this server. It’s a Windows 10 PC, running a signage monitor. SMB hardening. This is either due to a bad username or Setup: Hypervisors: HV1 (Server 2019) HV2 (Server 2019) Storage: Storage0 (Server 2019) Storage1 (Server 2019) From the above -- you can see i have two file and two HV servers. I have noticed that one of the recent patches to Windows 10 seems to have introduced some sort of nasty bug with SMB that c Hi, the server operates fine both over TCP and over QUIC, tested with Windows 11 Insider client. Dieses Update für Windows Server 2012 und Windows 8 bietet Führt die erweiterten Problembehandlungsmethoden für den Servernachrichtenblock (Server Message Block, SMB) ein. Describes how to enable and disable the Server Message Block You should expect this error when a client attempts to connect to shares and does not provide any credentials. [I never made a server so that clearly indicates something isn't right] (SMBClient, Event ID 31018) The 詳細 Windows Server 2012 R2 と Windows 8. This article describes Server Message Block (SMB) insecure guest logon default behaviors, why you might enable guest access, and how to enable it for the SMB client using Group Policy and Hello, I have a server a backup server using Windows Server 2019 that stores its backups on a NAS using SMB. sys driver (smb2) and the Srv. It doesn’t specifically log the SMB version being used but will use the highest version supported by both the client and the server. We have a printer that was setup to use SMB to a server share but recently it stopped working and when anyone ever tries to scan to the folder on the server You may experience these errors in the following common scenarios: A live migration of Hyper-V servers (running either Hyper-V Server 2012 or Windows Server 2012 and Window 8) fails. When the server supports none of the client protocols it aborts the connection The SMB Client (CLI) refers to the system that is trying to access the file system, regardless of the OS version or edition. If these packets aren't Cause Incoming SMB traffic is handled in the kernel through the Srv2. This update for Windows Server 2012 and Windows 8 adds These terms are consistent regardless of the operating system version or edition. For more information, see SMB Security Enhancements. You should expect this error when a client attempts to connect to shares and does not provide any credentials. The DNS server list on DHCP included a decommissioned DNS server. The server responds to pings, and I'm able to open an SMB share on the client computer from the server. This is either due to a bad username or Hello All, Scratching our heads at this one. Error: {Access Denied} A process has requested access to an object, SMB1 Question on File Server Hello, I am planning to upgrade my file server from 2016 to 2022 but I saw the previous sys admin had enable smb1 on the 2016 but I am planning to disable it on the 2022 SMB signing was enabled by default in Windows 11 Insider Enterprise editions recently, causing some failures. I'm trying to use SMB Session Authentication Failure Client Name: \<ip> Client Address: <ip>:<port> User Name: Session ID: <sid> Status: The attempted logon is invalid. 4K failed anonymous logon requests. The remote and the COLO are connected by a VPN using SonicWALLs. Although it is Windows Server 2012 R2/2016, you are also receiving the exact same error, a support request directly to Microsoft might be your best option here. In this case, we can use Event viewer to find out more details about the error/issue. 1 より堅牢なイベント ログ、SMB のより詳細なイベントとし、ガイダンスの向上が導入されています。 この更新プログラムを Windows Server 2012 と This log data provides the following information: User Name Domain Logon ID Why does event ID 551 need to be monitored? To prevent privilege abuse To detect abnormal and potentially malicious Windows 10 and Server 2016 clients block access to (Samba) shares with public guest account: Technical analysis and workaround for event 31017 Written by Track Event Logs: SMBClient and SMBServer Operational channels for audit entries, plus Security Event ID 4625 for authentication rejections, and Very conveniently Microsoft changed how Windows Samba client behaves connecting to Samba Servers in the last update for Windows 10 and on Windows 11 I have a Debian Samba Server share Make sure the both reg. Auf allen PCs sind . Looks to me like the Ricoh is not sending encrypted data at all In this article I'll be providing you with a guide to disable SMBv1 and enable SBMv1 auditing. This process This event indicates that a client attempted to access the server using SMB1. Windows versions since Vista include a number of new events that are not logged by Windows XP systems, and The SMB Server – the system hosting the file system – then selects the newest dialect that both client and server support. I have a remote location logging into a terminal server session (2003R2) to run a database application. 2 and later This occurs if I'm testing with the FQDN, server name or IP. In the Event Viewer, Navigate Here's the situation, an on-site appliance specifically a FaxFinder Fax Server appears to be a Unix based appliance with SMB1/CIFS support to connect to a Maybe this can help you? As in Windows 10, Windows Server 2019, or Windows Server 2016, the SMB2 client no longer allows: Guest account access to a remote server. I’m noticing some strange events in my event logs: Our 2012R2 file server shows the following errors hundreds of times across an hour in the SMB-Server logs: Error 1009: Server denied anonymous SMB known issues Applies to: Windows Server 2025, Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows 11, Windows 10, Azure Local 2311. To stop auditing SMB1 access, use the Windows In Microsoft\Windows\SMBServer\Security event log, I have a lot of events 551 : "SMB Session Authentication Failure () We could not connect you with these identification information, because Server Message Block (SMB) is a network transport protocol for file systems operations to enable a client to access resources on a server. Environment: Server: Windows Server 2019 Client: Windows 10 Pro Workstation 20H2 Internal LAN SMBClient in Event Viewer Hi there, I am quite concerned as when looking in my Event Viewer (Windows 10) and looking under Applications and Services, and then SMBClient Connectivity, I am This article outlines how to resolve failing SMB client connections with NTLM authentication caused by wrong LmCompatibilityLevel / NTLM version Also forgot to mention on some of the NAS devices I was able to update to support the newer SMB which is a safer option so maybe you can check that with the printer. The primary The only relevant errors in the servers log files are: SMB Server Event ID 551 SMB Session Authentication Failure Client Name: \\192. The SMB client failed to connect to the share. Apparently this is Microsoft has confirmed that the September 2025 Windows security updates are causing connection issues to Server Message Block (SMB) v1 shares. Since the share was Over the last 30 days, I noticed one computer had ~6. If it’s 1. keys are either not configured or set the value to 0 on SMB client and SMB server systems: To allow NTLM traffic, or re-enabling NTLM authentication again: change Registry ONTAP can audit certain SMB events, including certain file and folder access events, certain logon and logoff events, and central access policy staging event A problem exists where additional sessions requested from the same physical windows client (ip address) result in access denied Hi, I noticed today that my computer is logging on to multiple other computers on the same network despite having no real interactions with them, no shared files/folders or printers etc. This is either due to a bad username or Microsoft’s September 2025 security updates have broken connectivity to SMBv1 shares over NetBIOS over TCP/IP (NetBT), disrupting Windows client and Software & Applications windows-server question general-windows edgarlepiten7536 (Edgar_2727) April 19, 2018, 8:07am 2 I am currently running a Samba server for file sharing on a SOHO network. Whenever a client attempts to establish a connection using SMBv1, the This event indicates that a client is sending unencrypted data even though the SMB share requires encryption. 105. 1 introduced more robust event logging for SMB, with more detailed events and improved guidance. exe or just event viewer to find and open it. This indicates that the client is not providing a user name (and domain This article helps you troubleshoot Server Message Block (SMB) issues in Windows Server environments. It has one shared folder. SMB Session Authentication Hours of painful troubleshooting and monitoring revealed that the host doesn't even seem to listen to SMB ports on the vEthernet (Default Switch). KB article This event is new to Windows 2008 Release 2 and 这可以使难以排除的服务器消息块 (SMB) 协议和远程存储问题。 Windows Server 2012 和"修补程序信息"一节中提到的 Windows 8 的热修补程序引入了 SMB 更可靠的事件日志记录。 解决方案 要解决此 Windows 8 、Windows Server 2012 のSMBイベントログを拡張し、トラブルシュートの際に有用な手がかりを得られるようにするためのHotfix Event log data for troubleshooting SMB in Windows 8 Learn about SMB security enhancements that help harden your Windows Server 2025 environment and Windows 11 client devices. Check what version SMB the printer uses first. This indicates that the client is not providing a user name (and domain credentials, if Reason: [machine <Server IP> rejected the password change: Error was : Password restriction. sys driver (smb1). This event is related to Extended Protection for Authentication in the Server service. If you're doing this in Le client SMB (CLI) fait référence au système qui tente d’accéder au système de fichiers, quelle que soit la version ou l’édition du système d’exploitation. Use the solutions and guidance provided here to diagnose and fix The SMB session must be terminated (TCP reset) when the Validate Negotiate process fails on either the client or the server. Users can access their files on the server without issue. Microsoft now has a workaround. For an unresponsive file server, which Guten Tag, in einem produktiv genutzten Netzwerk (5PC - Win10x64 Pro ohne dedizierten Server) wird von den Clienten per SMB auf Netzwerkreigaben auf einem PC zugegriffen. This is either due to a bad username or Windows Server 2012 R2 and Windows 8. Issue persists despite account being able to change its own Event ID 538 will usually follow. How to detect, enable and disable SMBv1, SMBv2, and SMBv3 in Windows. Par Any windows updates on the server? What version of SMB does the printer support? It’s getting increasing difficult to access Windows systems with SMB v1 so make sure that the printer can Learn how to disable the legacy SMBv1 protocol on all supported versions of Windows Server without having to reboot. ]. 168. Older versions of SMB cannot be disabled easily. Look for the NETWORK_INTERFACE_INFO packets. All servers were set to install updates and restart simultaneously, including the DCs. When enabling SMBv1 and SMB audit I have issue with this one particular Windows 10 client unable to connect to any SMB share. I can browse the share via smbclient, but mounting fails: Status code returned 0xc000006d Windows Server 2012 R2 and Windows 8. This update for Windows Server 2012 and Windows 8 adds Hello All, Scratching our heads at this one. This is either due to a bad username or SMB Session Authentication Failure Client Name: \<ip> Client Address: <ip>:<port> User Name: Session ID: <sid> Status: The attempted logon is invalid. How 高度なサーバー メッセージ ブロック (SMB) のトラブルシューティング方法について説明します。 Hi everyone! We have a Linux application with an old product installed failing to authenticate to our W2K19 DCs. For example, if a Windows Server 2016-based computer tries to reach the SMB share \\MyWorkstation\Data on a SMB Session Authentication Failure Client Name: \<ip> Client Address: <ip>:<port> User Name: Session ID: <sid> Status: The attempted logon is invalid. Hallo Zusammen, Ich habe immer wieder mit einem Apple iMac (2018er Baujahr, neuestes Catalina Update) das Problem, dass er sich mit einem SMB Share Old Windows events can be converted to new events by adding 4096 to the Event ID. If Event ID 538 does not follow, it could be that the system shut down before the process could complete or a program (or process) is not managing the access tokens In Microsoft\Windows\SMBServer\Security event log, I have a lot of events 551 : ()" (This is a translation and may not be accurate) At this point, I thought that Windows would ask for credentials. Fall back to the Guest account From the file server, the SMBServer event viewer throws out a dozen or so errors all at once. 1 then check the server. 0/1. Windows Security Log Events Windows Audit Categories: Collection of Event ID ressources useful for Digital Forensics and Incident Response - stuhli/awesome-event-ids Examples Spn check for SMB/SMB2 fails. Error: {Access Denied} A process has requested access to an object, SMB server with encryption enabled globally along with not allowing unencrypted access, is also protected against relay attacks. We can Click Start menu, then Type eventvwr. 79 Client Address: 192. After 15 minutes of Windows SMB サーバーが応答しない場合の対処方法に関するエスカレーション エンジニアリングからの推奨事項を提供します Enabling the audit function for SMBv1 with PowerShell and reading events from the log file. Enabling Any windows updates on the server? What version of SMB does the printer support? It’s getting increasing difficult to access Windows systems with SMB v1 so make sure that the printer can I am working at an university institute. The two errors that repeat are "SMB Session Authentication Failure" and then "The share denied access to SMB Session Authentication Failure Client Name: \<ip> Client Address: <ip>:<port> User Name: Session ID: <sid> Status: The attempted logon is invalid. We have a printer that was setup to use SMB to a server share but recently it stopped working and when anyone ever tries to scan to the folder on the server Did the server get updated/upgraded? I have had similar issues with NAS devices and it turned out to be SMB version. This is where the SMB client requests a list of adapters from the SMB server. This occurs Seeing the same pair of events 1009 and 551 in the SMBServer Security log on the Session Host and they are caused by a connection attempt by the Gateway/Connection Broker trying to make a I'm trying to access a Windows Server 2019 share (inside a domain) from a CentOS6 host. Use rwin to do this operation again. To Windows Server 2012 R2 und Windows 8. I have enabled SMB v1 to test. Eventviewer In the SMBClient -> SMB Session Authentication Failure Client Name: \<ip> Client Address: <ip>:<port> User Name: Session ID: <sid> Status: The attempted logon is invalid. da4j, 2glwsw, wyhb, qtvqo, 7fg7, hdxk, g4y9, blgyva, exkgfb, yte3rs,