You can. Please check the File Access Management Guide for CIFS for details.
https://library.netapp.com/ecm/ecm_download_file/ECMP12454941
Eg: vserver fpolicy policy external-engine create -vserver-name vs1.example.com -engine-name engine1 -primary-servers 10.1.1.2,10.1.1.3 -port 6789 -ssl-option no-auth
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