{"id":108300,"date":"2022-09-01T03:56:25","date_gmt":"2022-09-01T03:56:25","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=108300"},"modified":"2026-05-07T06:57:05","modified_gmt":"2026-05-07T06:57:05","slug":"fix-exchange-error-hr-0x80004005-ec-1142","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/fix-exchange-error-hr-0x80004005-ec-1142\/","title":{"rendered":"How to Fix Error \u2013 HR 0x80004005 EC 1142?"},"content":{"rendered":"

In an Exchange Server system with high availability, you need to make use of Database Availability Groups (DAG). In a DAG setup, two or more nodes replicate between each other to ensure high availability of data in case of issues with hardware, software, or during planned maintenance. The system offers automatic failover of services as well.<\/p>

You may encounter the “hr 0x80004005 ec 1142” error during the normal operation of the system when adding a database copy or moving a mailbox from one database on a server to another database on the secondary server.  <\/p>

The problem may occur if the server queue size is limited. You might get this error when implementing a multi-mailbox search with lots of search options.<\/p>

The event log would read the following error:<\/p>

The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database.<\/p>

Database: DBX01\nError: MapiExceptionRecoveryMDBMismatch: Unable to open message store. (hr=0x80004005, ec=1165)\nDiagnostic context:\n    Lid: 55847   EMSMDBPOOL.EcPoolSessionDoRpc called [length=132]\n    Lid: 43559   EMSMDBPOOL.EcPoolSessionDoRpc returned [ec=0x0][length=248][latency=0]\nYou might also encounter the below error:\nProbe: EdiscoveryDeepTestProbe\/SRV-EXC-001\nLatency: 0ms\nError: MapiExceptionMdbOffline: Multi Mailbox Keyword Stats Search failed. (hr=0x80004005, ec=1142)\nDiagnostic context:\n    Lid: 49384 \n    Lid: 51176   StoreEc: 0x476    \n    Lid: 40680   StoreEc: 0x476    \n    Lid: 46696   StoreEc: 0x476    \n    Lid: 63080 \n    Lid: 38504   StoreEc: 0x476    \n    Lid: 58984 \n    Lid: 34408   StoreEc: 0x476    \nDetails:\nLog:\n-------------------------------------------------------------------------------\nStates of all monitors within the health set:\nNote: Data may be stale. To get current data, run: Get-ServerHealth -Identity 'SRV-EXC-001' -HealthSet 'Ediscovery.Protocol'<\/pre>
When creating a database copy and trying to add it to the Database Availability Group (DAG)<\/a>, you may get the following error during the seeding process.<\/p>
The seeding operation failed. Error: An error occurred while performing the seed operation. Error: Failed to open a log truncation context to source server 'EXSRV01.domain.com'. Hresult: 0xc7ff07d7. Error: Failed to open a log truncation context because the Microsoft Exchange Information Store service is not running. [Database: DB01, Server: EXSRV01.domain.com]<\/pre>
To troubleshoot the issue, you can use the Test-MapiConnectivity command.<\/p>
\"\"<\/figure>
This command will verify the server’s functionality. It will verify that the MAPI server, Exchange Store, and Directory Service Access (DAccess) are working fine.<\/p>
unspaceId  : e8a087f1-6197-48df-b094-d5c93a7b6070
Server      : SRV01
Database    : DB01
Mailbox     : SystemMailbox{123e8d54-4444-484a-a0a3-58f22d73236f}
MailboxGuid :
IsArchive   :
Result      : *FAILURE*
Latency     : 00:00:00
Error       : [Microsoft.Exchange.Data.Storage.MailboxOfflineException]: Cannot open mailbox \/o=First
Organization\/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)\/cn=Configuration\/cn=Servers\/cn=SRV01\/cn=Microsoft System Attendant. Inner error
[Microsoft.Mapi.MapiExceptionMdbOffline]: MapiExceptionMdbOffline: Unable to make connection to the server. (hr=0x80004005, ec=1142)<\/pre>
Solutions to Resolve the hr 0x80004005 ec 1142 Error<\/strong><\/h2>