Exchange 2019 CU9 Search not working (clean install)

vlada cink 21 Reputation points

I have clean install of Exchange2019 CU9 also with KB5001779 installed. All OS updates, system is uptodate.

Search in OWA not working. In log I can see ID 1006 with message I copied down.

Another Exchange 2019 server with CU 8 installed is OK.

Can somebody help ? (I found "C:\Users\All Users\Microsoft\Crypto\RSA" solution with restart services, but it damage certs trustionship after server reboot)

Thank you !

An operation attempted against a FAST endpoint exprienced an exception. This operation may be retried. Error details: Microsoft.Exchange.Search.Fast.PerformingFastOperationException: An Exception was received during a FAST operation. ---> System.ServiceModel.CommunicationObjectAbortedException: The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it has been Aborted.

Server stack trace:
at System.ServiceModel.Channels.CommunicationObject.ThrowIfDisposedOrNotOpen()
at System.ServiceModel.Channels.ServiceChannel.EnsureOpened(TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at Microsoft.Ceres.ContentEngine.Admin.FlowService.IFlowServiceManagementAgent.GetFlows()
at Microsoft.Exchange.Search.Fast.FastManagementClient.PerformFastOperationTManagementAgent,TResult

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Yuki Sun-MSFT 24,761 Reputation points

    Hi @vlada cink ,

    Search in OWA not working.

    By this, do you mean no result is returned or the search results are not complete?
    Is it affecting all users in your environment?
    How about having a try in Outlook and switching between Exchange cached mode and Online mode to see if there would be any difference?

    Besides, please make sure the following services are running properly:

    • Microsoft Exchange Search
    • Microsoft Exchange Search Host Controller

    It's also suggested to try moving an affected mailbox to another mailbox database and see how it goes.


    Unlike previous versions of Exchange, the search index in Exchange 2019 is now held within the mailbox. For your situation, it's likely that there are some indexing issues with the affected mailboxes.

    I tried to search a lot but did't find any official document stating the possible causes for this kind of indexing issues so personally I cannot say that for sure if it's related to the patch you applied recently. Howerver, based on my previous experience and research, in most similar occasions, moving the mailboxes to another database can help solve the search issues. So in case you encounter a similar search issue in your Exchange 2019 environment in the future, you can try it again by moving a mailbox to a new database. Here's another thread related to search issue in Exchange 2019 which was also finally resolved by moving the mailbox:

    Microsoft Exchange 2019 search issues since CU8 and HAFNIUM patches

    And this is a blog which hopefully can be helpful:
    Fixing Search/Indexing issues within Exchange 2019 mailboxes.
    Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

    If an Answer is helpful, please click "Accept Answer" and upvote it.
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