Failed to access vCenter with using Dell PowerProtect Data Manager (PPDM)

Products

• VMware vCenter Server

Issue/Introduction

• Dell PowerProtect Data Manager (PPDM) Discovery failed to connect to vCenter. 
• vCenter Event log shows:

[YYYY-MM-DDTHH:MM:SS] [vim.event.BadUsernameSessionEvent] [error] [######] [] [21754xxx] [Cannot login ######@##.##.##.##]

• vpxd log:

YYYY-MM-DDTHH:MM:SSZ info vpxd[437xxx] [Originator@6876 sub=vpxLro opID=4bb0xxx] [VpxLRO] -- BEGIN lro--17348xxx -- SessionManager -- vim.SessionManager.login --  ######-######-######-######
YYYY-MM-DDTHH:MM:SSZ error vpxd[437xxx] [Originator@6876 sub=UserDirectorySso opID=4bb0xxx] AcquireToken exception: N9SsoClient27InvalidCredentialsExceptionE(Authentication failed: Invalid credentials)
--> [context]xxx[/context]
YYYY-MM-DDTHH:MM:SSZ error vpxd[437xxx] [Originator@6876 sub=User opID=4bb0xxx] Failed to authenticate user <######>

Environment

VMware vCenter Server 8

Cause

Invalid credential of user <######> used from IP  (##.##.##.##) .

Resolution

Check the user <######> credential from source VM/services based on the IP address (##.##.##.##) reported from vCenter Event log.