Authentification failure error occurs when connecting to pstorage-iscsi target.
The following message can be found in system event log
Log Name: System Source: iScsiPrt Date: 5/25/2015 9:26:08 PM Event ID: 35 Task Category: None Level: Error Keywords: Classic User: N/A Computer: pcw Description: Target CHAP secret is smaller than the minimum size (12 bytes) required by the spec.
CHAP secret should meet password complexity requirements: For Windows initiators, the CHAP secret length must be a minimum of 12 characters and a maximum of 16 characters.
Change pstorage-iscsi account password to meet Windows initiators requirements:
#pstorage-iscsi account-set -u