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SMB Dialect Issue

phab_lucky

I developed a custom CIFS server some time back using JLAN embedded and everything was working great. After a couple of months without using it, I tried to connect from the same Windows 7 Pro machine used in development and got the following error message on the server's console:

[T10] Failed to negotiate SMB dialect

I debugged the negotiation process and found out that my client is sending the following dialect strings:

NotSmb,NotSmb,NotSmb,NotSmb,NotSmb,NotSmb,SMB 2.002,SMB 2.???

On the other hand, the server's supported dialects are:

[DOS LANMAN 1.0,LANMAN1.0,DOS LANMAN 2.1,LM1.2X002,LANMAN2.1,NT LM 0.12]

I don't understand why this stopped working after a couple of months and don't know which dialects my client was reporting earlier. Does anyone know what might have happened here?

Regards.

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Alfresco Content Services

Comments

afaust

Microsoft may have disabled the old (obsolete) SMB dialect that JLAN supports via an update. This was announced for Windows 10 sometime this year and may also have been planned/executed for WIndows 7 (I no longer follow updates for Windows 7).

phab_lucky

Really?? I suspected of something like that and tried to enable SMB1 via sc.exe command, but nothing happened. Any clue on how to keep this working? Any hope that JLAN will support the more modern dialects?

afaust

JLAN is a defunct project (there has not been any release since 2009) and is currently only maintained as an embedded library of Alfresco Content Services. In your place I would have higher hopes for hell freezing over than JLAN standalone supporting newer SMB dialects.

The community has besieged Alfresco for years to consider supporting newer SMB dialect versions. The announcement by Microsoft has sparked renewed dialogue within this platform, and at least an epic now exists in Alfresco JIRA for potential consideration in future development. Even if Alfresco decides to implement SMB 3 there is no guarantee that it will be available in the Open Source version. Alfresco is looking to have technical differentiators to support their business model for the commercial version, and since WebDAV can be used to mount Alfresco as a drive, a vast majority of users of the Community Edition may not have the need to have SMB 3 available to them. The typical rule of thumb is that any feature that a majority of customers / end-users are going to need in some form will be considered for the Open Source version, while features that only benefit a small number of special, big Enterprise-like use cases will likely be reserved for the commercial version.

phab_lucky

Thank you for the insightful reply. In any case, I have this issue that I need to address in the near term. Could you provide me any porinters on how to undo whatever change this Windows update has caused to my system?

Much appreciated.