CIFS, SMB1, SMB2, SMB3 Protocols
Definition of CIFS, SMB2, and SMB3 protocols. Information about the deactivation of SMB1 protocol and system implications.
This article applies to: Shared File Services
Shared File Services supports the SMB2 and SMB3 protocols.
The SMB1 protocol was removed effective 4/29/2018 from the Cornell Active Directory (AD) Domain Controllers and the
\\files.cornell.edu DFS servers used by SFS.
SMB1 is not supported.
Lack of SMB1 may impact older systems that require the protocol, including:
- Windows XP
- Windows Server 2003
- Network printers
- Other network-connected devices with embedded systems using SMB1
- Linux systems running outdated versions of Samba.
Impact may include the inability to access network shares, process GPOs, browsing the "Network," printers being unable to scan or save to a network share, or similar actions.
MacOS users who map to Windows shares via
cifs://files.cornell.edu/OU/SHARE will experience failures. This happens because the cifs prefix forces a SMB1 connection from MacOS, which is no longer supported.
More background on this issue:
- Security Alert: System admins - disable Windows SMB1
- SMB1 removed from cornell.edu domain Active Directory and Shared File Services
For additional information regarding the SMB protocol see Wikipedia.