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All VNX CIFs servers are joined the domain. We got a request from the IT audit team to enable SMB signing on all CIFs servers. After some research, we found that we have to create AD GPO " If you cannot open/map network shared folders on your NAS, Samba Linux server, computers with old Windows versions (Windows 7/XP/Server 2003) from Windows 10, most likely the problem is that legacy and insecure versions of the SMB protocol are disabled in the latest Windows 10 builds (SMB protocol is used in Windows to access shared network folders and files). Sets the SMB username or username and password. If %password is not specified, the user will be prompted. The client will first check the USER environment variable, then the LOGNAME variable and if either exists, the string is uppercased.

Default: FALSE. Group Policy settings are not applied on member computers that are running Windows Server 2008 or Windows Vista SP1 when certain SMB signing policies are enabled. http://support.microsoft.com/kb/950876. On Windows, this is found in the policy setting 'Microsoft network server: Digitally sign communications (always)" By default SMB signing is disabled (except domain controllers), enabling it will come with performance payback (around 15% performance decrease). My questions: To configure client-side SMB message signing in Windows NT 4.0 post service pack 3, and in Windows 95/98 computers running the Directory Services client, add the REG_DWORD registry value RequireSecuritySignature or EnableSecuritySignature and set the value to 1.

SMB packets indeed showed signed. So I said lets test the opposite namely to configure the SMB server to require signed SMB and to disable SMB signing on the client, that should deny access through SMB to the server (at least in theory).

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For this reason, it is advised to disable support for this SMB version whenever it is possible. Note however, that Microsoft Windows XP and Windows Server 2003 and older systems do not support newer SMB versions.

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2016-04-21 · Thanks for your post. The easiest way to verify if the GPO settings are taking place is to check the related Registry Keys on the SMB client and SMB server. Please refer to the following tables and articles: https://blogs.technet.microsoft.com/josebda/2010/12/01/the-basics-of-smb-signing-covering-both-smb1-and-smb2/. To enable or disable SMB protocols on an SMB Server that is running Windows 7, Windows Server 2008 R2, Windows Vista, or Windows Server 2008, use Windows PowerShell or Registry Editor. PowerShell methods.

Go to “Network Services” > ”Win/Mac/NFS”. Optimized performance thanks to the new queue function for SMB requests; Support of symbolic links (connections to files or directories) Intermediary storage/caching of file properties; Improved message signing (HMAC SHA-256 algorithm) Better scalability thanks to a greater maximum number of clients, shared objects, and simultaneously opened files Centralize data storage and backup, streamline file collaboration, optimize video management, and secure network deployment to facilitate data management. So, incase you have not heard, SMB1 is Bad… Really BAD. Not only is it woefully old and inefficient protocol it’s also now widely known to be the attack vector for the recent WannaCry virus. By now you probably have seen my very popular previous blog post called How to disable SMB 1 on Windows 7 via Group Policy to Prevent WannaCry. SMB signing needs to be disabled in the domain controller 'Local Security Policy'. Policy is applied in "LSDOU" order (Local, Site, Domain, then OU containers in hierarchical descending order). So more than one policy may need to be modified, depending on which have the policy items enabled/disabled/undefined (with attention to policy blocking and block override).
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When SMB signing is enabled on both the client and server SMB sessions are authenticated between the machines on a packet by packet basis. This does have a performance hit of between 10 to 15% as every packets signature has to be verified. To enable SMB signing on the NT Server perform the following: Start the Registry Editor (Regedit.exe) The z/OS Distributed File Service SMB server does not support server-side SMB digital signing. The determination of whether to use and enforce digital signing is performed during the initial negotiation and session setup of SMB transactions between the supported clients, the z/OS DFS/SMB server, and the Microsoft Domain controllers if passthrough authentication is configured.

SMB (port 139) is the older more proprietary file sharing protocol, while CIFS (port 443) is an internet standard. In 1997 Hobbit published a number of vulnerabilities in SMB including some serious man-in-the-middle attacks. Microsoft made several enhancements to SMB including SMB message signing to combat man-in-the-middle attacks: The Server Message Block (SMB) protocol provides the basis for file and print sharing and many other networking operations, such as remote Windows administration.
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Blir tokig snart.. NAS strul. - Lagring - SweClockers

Varför och hur du stänger av SMB1 på Windows 10/8/7 - Fönster