SMB protocol does not work after macOS 11.3.

Question

Created May ’21

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Around the end of April, macOS 11.3 was released as you know.
After updating my M1 MacBook Pro form macOS 11.2.3 to macOS 11.3, I cannot access NAS(HDD storage) from Mac suddenly.
The smb communication between the Mac and NAS doesn't seems to be working.
I suspect it's a macOS bug.
Is there anyone who has encountered a similar problem?

Answered by Treesome in 679926022

I finally found a workaround about this problem.

Enter the folowing commands on the terminal window.

echo "[default]" | sudo tee -a /etc/nsmb.conf

echo "protocol_vers_map=2" | sudo tee -a /etc/nsmb.conf

SMB Version 2 will be enabled.

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Answer 1

Treesome OP

May ’21

I called Apple technical support yesterday. The person in charge said that it might be a compatibility issue between macOS and NAS. The environment information of the Mac was downloaded and will be analyzed. Results will be reported next week.

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Answer 2

Treesome OP

Jun ’21

Canceld

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Answer 3

Treesome OP

Jun ’21

The root cause may still be on the macOS side. If you connect to a NAS that supports only SMB Version 1.0, it will succeed, and you will not be able to connect to a NAS that supports SMB Version 2.0. It seems that macOS Big Sur 11.3 and later does not support SMB Version 2.0.

0

Answer 4

Treesome OP

Jun ’21

Accepted Answer

I finally found a workaround about this problem.

Enter the folowing commands on the terminal window.

echo "[default]" | sudo tee -a /etc/nsmb.conf

echo "protocol_vers_map=2" | sudo tee -a /etc/nsmb.conf

SMB Version 2 will be enabled.

0