i recently installed windows updates on a domain controller in late march 2015. the updates included KB3002657 which apparently has been causing problems with a lot of NAS devices. the issue we experienced was users getting asked for credentials when trying to access the FS7600 CIFS shares (even though they already had an active kerberos session). when a user entered their AD credentials the credentials would be rejected. the problem was intermittent since only one DC had the updates applied.

klist
setspn -l [dns name]
the above did not list the fs7600, even though it should have

setspn -l fs7600 (assuming “fs7600” is the computer account name)
this returned info…

we then did the following to resolve the issue:
setspn -S HOST/[hostname] fs7600
setspn -S HOST/[FQDN] fs7600
setspn -S nfs/[hostname] fs7600
setspn -S nfs/[FQDN] fs7600
klist

info: http://support.microsoft.com/en-us/kb/3002657

also to reboot the fs7600 controllers w/ firmware 3.x:
SSH in
native-FluidFS-CLI
CLI/hardware/NAS-appliances/reboot-controller

update 7/24/2015:
update KB3068457 also creates this issue which affects mac users trying to access NAS shares.
https://support.microsoft.com/en-us/kb/3068457

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