vnx unified cifs server problem

hi ，all

   l  have a vnx 5700 , there are two file system export to cifs server before , this cifs server is join the AD , now the AD is unused and DNS also , the customer want to copy this two file system  , l try to export it to standalone cifs , but can not open the file and copy , the error is no permission , l modify the cifs server administrator password and try to connect the cifs server , but same error , what should l do ?  the next step , l will export it  to nfs  and use the Linux to mount it  !