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Event ID 2084 occurs and Exchange server loses connection to the domain controllers in an Exchange Server 2010 environment

Symptoms
Assume that you have some Active Directory sites in a Microsoft Exchange Server 2010 environment. You add some Microsoft Exchange servers, in particular, Client Access Servers that have OWA virtual directories configured. In this situation, the following events may be logged:

Log Name:      Application
Source:        MSExchange ADAccess
Event ID:      2070
Task Category: Topology
Level:         Information

Description:
Process w3wp.exe () (PID=10860).  Exchange Active Directory Provider lost contact with domain controller domain_controller.  Error was 0x51 (ServerDown) (Active directory response: The LDAP server is unavailable.).  Exchange Active Directory Provider will attempt to reconnect with this domain controller when it is reachable. 

Log Name:      Application
Source:        MSExchange ADAccess
Event ID:      2070
Task Category: Topology
Level:         Information

Description:
Process w3wp.exe () (PID=10860).  Exchange Active Directory Provider lost contact with domain controller domain_controller.  Error was 0x33 (Busy) (Additional information: The LDAP servers network send queue has filled up because the client is not processing the results of it's requests fast enough. No more requests will be processed until the client catches up. If the client does not catch up then it will be disconnected.

Active directory response: 000021A8: LdapErr: DSID-0C06056F, comment: The server is sending data faster than the client has been receiving.  Subsequent requests will fail until the client catches up, data 0, v1db1).  Exchange Active Directory Provider will attempt to reconnect with this domain controller when it is reachable.

Additionally, event ID 2084 and event ID 1216 may be logged too. These events may cause Exchange to lose its connection with all in-site domain controllers. Then, Exchange may use domain controllers in other sites. In this situation, client users cannot connect to Exchange. 
Resolution
To resolve this issue, install the following update rollup:
2936871 Update Rollup 6 for Exchange Server 2010 Service Pack 3

Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information

Event Information

Event Information

Event ID 2084

Event ID 2084 that resembles the following is logged when Exchange loses the connection:

Event ID: 2084
Source: MSExchange ADAccess
Information DateTime MSExchange ADAccess 2084 Topology "Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1112). No Domain Controller server is up in the local site 'local site'. Exchange Active Directory Provider will use the following out of site Domain Controller servers:
Server list

Event ID 1216 

When the domain controller disconnects the Exchange, event ID 1216 is logged in the Directory Service log:

Log Name: Directory Service
Source: Microsoft-Windows-ActiveDirectory_DomainService
Date: Date
Event ID: 1216
Task Category: LDAP Interface
Level: Warning
Keywords: Classic
User: N/A
Computer: Computer
Description:
Internal event: An LDAP client connection was closed because of an error.

Client IP:
Client IP

Additional Data
Error value:
8616 The LDAP servers network send queue has filled up because the client is not processing the results of it's requests fast enough. No more requests will be processed until the client catches up. If the client does not catch up then it will be disconnected.
Internal ID:
ID


For more information about Active Directory maximum limits, go to the following Microsoft website:For more information about event ID 2084, go to the following website:
Properties

Article ID: 2952799 - Last Review: 03/11/2016 13:18:00 - Revision: 4.0

Microsoft Exchange Server 2010 Service Pack 3

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