How to disable less secure legacy dialects on RHEL 8 CIFS client?

Environment

• Red Hat Enterprise Linux (RHEL) 8

Issue

• How to disable less secure legacy dialects on RHEL 8 CIFS client?
• How to disable (CIFS/SMB1 and vers=2.0)?

Resolution

• To disable less secure legacy dialects when loading the CIFS module.

# modprobe cifs disable_legacy_dialects=1 

• To disable less secure legacy dialects when the CIFS module is already loaded.

# echo 1 > /sys/module/cifs/parameters/disable_legacy_dialects

Y or 1  stands for enabled
N or 0 stands for disabled

Also if you want the change to be persistent after reboot, create the file /etc/modprobe.d/cifs.conf and add the below line:

options cifs disable_legacy_dialects=1 

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