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KB-4364: What is the main difference between SMB and SMB2 and what is the side effect of switching off SMB2?

Centrify DirectControl ,   Centrify Identity Service, Mac Edition ,  

12 April,16 at 11:22 AM

Applies to: All versions of Centrify DirectControl

Question:

In KB-4023, there is a suggestion to turn off SMB2.

What is the main difference between SMB and SMB2, are there any side effects of switching off SMB2?


Answer:

The main difference is SMB2 (and now SMB3) is a more secure form of SMB. It is required for secure channel communications.

The DirectControl agent (adclient) uses it to download Group Policy and uses NTLM authentication. 

The side effect of turning off SMB2 is that adclient will revert back to use SMB and as a result will disable support for SMB signing.
If the Domain Controller is configured to require SMB signing, group policy updates and NTLM authentication will fail.

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