Whatever your windows server is a member of workgroup or domain, you can configure snapdrive (windows server) trasport protocol settings to authenticate with the storage system.
There are three types of protocols for authentication
a. RPC
b and c. HTTP or HTTPS
after that you can configure a local computer account (hostname\username) or a (domainname\username) that is local or domain administrator to the storage system.
For a Domain User service account that runs with SnapDrive, CIFS must be enabled and configured in the storage with the domain for your network.
Also, be sure that the following ports are open between server and the storage system.
netbios-ns 137/TCP ¡§C For RPC on CIFS
netbios-dgm 138 TCP ¡§C For RPC on CIFS
netbios-ssn 139/TCP ¡§C For RPC on CIFS
RSH 514/TCP(between host and filer)
The following outgoing ports are generally required for any network connected Windows system:
464 - kerberos password
53 - DNS
389/TCP - LDAP
88 - Kerberos
HTTP 80
HTTPS 443
Snapdrive Webservice 808
snapdrive Webservice HTTP 4094
Snapdrive Webservice HTTPS 4095
Good luck!