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How to Disable SMBv2 in Vista and Windows 7See also: Windows 7 Networking Problems Windows Vista introduced a new SMB protocol, version 2. It often causes problems:
This affects Windows 7 too. Turning off SMBv2 fixes these problems for me. If you are not having problems, however, the recommendation is to leave SMBv2 turned on.
Turning SMBv2 OffRun the following two commands from an elevated command prompt: sc config lanmanworkstation depend= bowser/mrxsmb10/nsi This sets the following registry value: HKLM\System\CurrentControlSet\services\LanmanWorkstation\DependOnService sc config mrxsmb20 start= disabled This sets the following registry value: HKLM\System\CurrentControlSet\services\mrxsmb20\Start Turning SMBv2 On AgainRun the following two commands from an elevated command prompt: sc config lanmanworkstation depend= bowser/mrxsmb10/mrxsmb20/nsi This sets the following registry value: HKLM\System\CurrentControlSet\services\LanmanWorkstation\DependOnService sc config mrxsmb20 start= auto This sets the following registry value: HKLM\System\CurrentControlSet\services\mrxsmb20\Start ThanksThanks to Richard at axon IT for his blog post which helped me solve this problem. More InfoSome really good info about the differences between SMBv1 and v2 here: http://www.danieletosatto.com/2010/10/22/smb-tuning-for-xenapp-and-file-servers-on-windows-server-2008/ This also mentions that SMB 2.0 Sessions are per user NOT per computer - this means that for example a terminal server or virtualised server will only open one connection on SMBv1. In this example SMBv2 will bring a great performance boost. |