Event ID 2270 is received with HRESULT 0X800706BA when attempting to retrieve an archived item

Problem

Users are unable to retrieve archived items and event ID 2270 is logged with the error "A queued operation exceeded the retry count and has been discarded"

Error Message

Source:       Enterprise Vault
Event ID:     2270
Task Category: Retrieval Task
Level:         Warning
Computer:     
Description:
A queued operation exceeded the retry count and has been discarded
(Retrieval)
m_pIExchangeRestorationAgentUpdate->SavesetAvailable(OriginatingClient = "14B9CCBF19DA1C1439A0DB80956E07AD71c10000VAULT",
  pISaveset,
  AgentParamsSize = 663,
  pAgentParams,
  NULL,
  nRetryCount = 3,
  NULL,
  PSTFile = "", RestoreAndDelete = "FALSE",
  PSTFormat = "UNICODE",
  RestoreShortcuts ="FALSE");
HRESULT: 0x800706BA

V-437-2270

Following lines can be seen in the Dtrace of ArchiveTask process

Callers domain controller = DC1
Error (0x000006BA - The RPC server is unavailable.|) occurred when dealing with DACL

Cause

Name resolution or blocked RPC ports prevent Enterprise Vault from querying the domain controller to determine if the user has access to the requested archive

Solution

Ensure that the Netbios and FQDN names of the domain controllers are reachable from the EV server via RPC.

Use Ping and the RPCPing utility to determine if the required connectivity is available.  The RPCPing utility can be downloaded from the Microsoft website.  The format to use is RPCping -s [servername]