OA54275: DFS SMB RESTRICTIONS. WINDOWS 10 SMBV2 SMBV3

APAR status

• Closed as documentation error.

Error description

• The zOS DFS/SMB server DFSKERN does not support Windows 10
  It also does not support ANY Microsoft / CIFS / SMB Protocol
  other than SMBv1
  
  The newer SMBv2 and SMBv3 etc. are not supported.
  There are also no plans to provide this support in the future.
  
  In addition, a clarification of the existing DFS/SMB
  documentation in SC23-6886-01  z/OS V2R2 Distributed File
  Service SMB Administration  in section 'About this
  document' where it is stated as follows:
  
  "Distributed File Service includes an SMB function that is based
   on the X/Open SMB Version 2 specification and the IETF RFCs on
  NetBIOS over IP (RFC1001 and RFC1002)"
  
  This statement is NOT referring to the above restictions on the
  newer Microsoft / CIFS  SMBvX protocols.
  
  
  SMBV2
  SMBV3
  WIN10
  

Local fix

• Do not use Windows 10
  Only use the SMBv1 protocol on supported Windows clients
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the z/OS Version 2 Release 1    *
  *                 Distributed File Service SMB                 *
  *                 Server (FMID H0H2410).                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Documentation apar to clarify SMB       *
  *                      protocol client support.                *
  ****************************************************************
  * RECOMMENDATION: UPDATE DOCUMENTATION                         *
  ****************************************************************
  This documentation APAR is being provided to identify that
  the Windows 10 SMB client is not supported and to clarify a
  section in the Distributed File Service Administration
  (SC23-6886-30) document.
  

Problem conclusion

• The zOS DFS/SMB server DFSKERN does not provide support or use
  for Microsoft Windows 10 clients. Support is only provided to
  the clients listed in the z/OS Distributed File Service SMB
  Administration document SC23-6886-30 allowing SMBv1 protocol
  traffic. SMB traffic for protocols later than SMBv1 will not
  be accepted.
  
  The second paragraph in the  "About this document" section is
  being replaced with the following:
  
  Distributed File Service includes an SMB function that is based
  on the X/Open SMB Version 2 specification and the IETF RFCs on
  NetBIOS over IP (RFC1001 and RFC1002).. The Version 2
  specification refers to the publication level and does not
  imply support of the SMBv2 protocol or later.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels