Dell MD Storage Array vCenter plugin can't authenticate with vCenter S

Anyone tried latest Dell MD Storage Array plugin with vCenter Standalone Appliance?

I'm trying to install it, but when I enter vCenter credentials, it fails with an error.

but credentials are correct.

In /var/log/messages of vCenter I see:

Sep 29 13:06:10 vcenter vpxd: pam_unix2(vmware-authd:auth): Unknown option: `try_first_pass'
Sep 29 13:06:10 vcenter vpxd: pam_tally(vmware-authd:auth): pam_get_uid; no such user
Sep 29 13:06:10 vcenter vpxd: pam_unix2(vmware-authd:auth): Unknown option: `try_first_pass'

just after the unsuccesful login and plugin installation log says:

arrayName is : array
29-set-2011 14.41.54 org.apache.axis.utils.JavaUtils isAttachmentSupported
AVVERTENZA: Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled.
AxisFault
faultCode: ServerFaultCode
faultSubcode:
faultString: Cannot complete login due to an incorrect user name or password.
faultActor:
faultNode:
faultDetail:
{urn:vim25}InvalidLoginFault:null

Dell plugin version is: Dell MD Storage Array vCenter Plug-in 2.3 - 64-bit

Fixes for version 2.3
---------------------
* Added support for vSphere 5.0

maybe vCenter Storage Appliance is not supported?