As others have also mentioned : The time difference (clock skew) between the cluster and the domain controller must not be more than five minutes. Just googling, it appears Central Time is 1 hour ahead of Mountain Time.
Does the 'status' say 'OK' ?:
::> vserver cifs domain discovered-servers show
1) Just RDP to one of your "DC server" and check time there.
2) Login to cluster: check the date & time/timezone?
::> date
Node Date Time zone
--------- ------------------------ -------------------------
3) Enter the following command to change it to whatever timezone is "on the DC".
timezone -
-timezone -version
BRDRSANCL1::> timezone -timezone
Africa/ America/ Antarctica/ Arctic/ Asia/ Atlantic/
Australia/ Brazil/ CET CST6CDT Canada/ Chile/
Cuba EET EST EST5EDT Egypt Eire
Etc/ Europe/ Factory GB GB-Eire GMT
GMT+0 GMT-0 GMT0 Greenwich HST Hongkong
Iceland Indian/ Iran Israel Jamaica Japan
Kwajalein Libya MET MST MST7MDT Mexico/
NZ NZ-CHAT Navajo PRC PST8PDT Pacific/
Poland Portugal ROC ROK Singapore Turkey
UCT US/ UTC Universal W-SU WET
Zulu
4) check the date/time timezone again and ensure it is in sync with DC, with 5 mint difference.
::> date
5) If not manually set the date/time:
::> date YYYYMMDDHHMM
Once the time are in sync, wait for sometime, it will be sorted. Else, you can re-set it.
https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.cdot-famg-cifs%2FGUID-CAED5556-D751-4BCA-BF39-EFDEEBC1312A.html
Thanks!