Had a problem the other day where I could not login to Unisphere on a VNX after doing the configuration with VIA. I could login to root locally (sometimes) but not sysadmin. After doing a little hunting and seeing that I could get into SSH on the CS0 with root. I ran the following command
/nas/sbin/navicli -h spa security -adduser -user temp -password temp -scope 0 -role administrator
This created a username and password of temp for unisphere and allowed me to login. No clue what made unisphere not like the password when I set it up with VIA but the other 2 accounts had no problems.