Windows 10 and problems accessing smb shares

Last night I had to do some testing under Windows 10 and to my surprise I was unable to access smb network share.

I have done some investigation and it would appear that Windows 10 will try to negotiate SMB3_11, which Samba 4.1.1  doesn’t yet support except in the current 4.3 release candidate.

To fix this I disabled SMB 3 and enabled v1:

To disable SMBv2 and SMBv3 on the SMB client, run the following commands:

sc.exe config lanmanworkstation depend= bowser/mrxsmb10/nsi 
sc.exe config mrxsmb20 start= disabled
To enable SMBv1 on the SMB client, run the following commands:
sc.exe config lanmanworkstation depend= bowser/mrxsmb10/mrxsmb20/nsi 
sc.exe config mrxsmb10 start= auto

After restarting Win10 instance I was back in action.
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2 comments

  1. Nick says:

    Given the guidence from MS, US-CERT etc to disable SMB v1, I hope you long ago moved you SMB shares to a service supporting SMB v3 and removed this work around:

    https://www.socpedia.com/warning-from-us-cert-shadow-brokers-selling-a-zero-day-exploit-targeting-the-server-message-block-protocol