No way to force the SMB2 instead of SMB3

Running Server 5.0.13 on a Mac Mini to 2015 10.11.3

I have a very strange problem running a particular software on client computers. The software cannot write to a particular file type (the. INI files necessary for the operation of the program), but only when he tries to write the file to the file of OS X Server (which connects via SMB 3.0). It can write the file locally and on an old Windows Server (which connects via SMB2.1) and the program can write other files on the OS X file server - just not the. INI

Permissions do not appear to be the problem, because they are currently open. I think at this point, it must be something weird with SMB 3.0, or opportunistic locking. Any advice on force the connection to SMB2, either change the opportunistic locking would be appreciated.

OS X uses now the implementation of SMBx own SMB Apple, rather than the more common implementation of SAMBA, so methods and SMB on a Mac configuration options are now different and much more limited.

If it's a Mac user with a connection to an SMB server problem, so the file in question would be ~/Library/Preferences/nsmb.conf which is in the individual user preferences folder. This file does not exist in the standard sense, the default settings are used, if this file is created with valid parameters, and then it replaces the default settings.

For a Mac operates as a SMB server, however it is less clear what are the options, there is a file preferably to Library/Preferences/SystemConfiguration/com.apple.smb.server.plist, but Apple tell you do not change this file because it is kept is updated by the software to Apple for example Server.app. This means that if change you it then probably any change would be quickly replaced again by own Apple software.

The other option remaining is /etc/nsmb.conf that this file also however does not exist in standard. Once again if you create it will substitute the substitution of parameters by default and identical options in a clean users ~/Library/Preferences/nsmb.conf

I suggest doing the following in Terminal.app to read the documentation from Apple on this topic.

NSMB.conf man

smbd man

My best guess would be the creation of /etc/nsmb.conf on your Mac server with an option to define smb2_only may be the best approach. What isn't clear, is find out if this applies only to the use of a Mac as a customer or if it will also apply to be a server.

Tags: Servers and Enterprise Software

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