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We are working on dynamics 365 CE Online and Exchange Server on-premise (15.01.1531.003)We are receiving thousands of this error message when we have a look at the Email Server Profile popup window on altering the errors section.
Email cannot be received for the mailbox XXX, YYY because an error occurred while establishing a secure connection to the email server. The mailbox didn't synchronize. A notification about this is posted on the alerts wall for the owner of the email server profile XXXX Exchange.Email Server Error Code: Web server returned SecureChannelFailure exception
ActivityId: 9c11ce67-9bc3-483d-ab5b-c2d599ea51b8>Error : System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel. at System.Web.Services.Protocols.WebClientAsyncResult.WaitForResponse() at System.Web.Services.Protocols.WebClientProtocol.EndSend(IAsyncResult asyncResult, Object& internalAsyncState, Stream& responseStream) at System.Web.Services.Protocols.SoapHttpClientProtocol.EndInvoke(IAsyncResult asyncResult) at Microsoft.Crm.Asynchronous.EmailConnector.ExchangeServiceBinding.EndFindItem(IAsyncResult asyncResult) at Microsoft.Crm.Asynchronous.EmailConnector.FindItemsStep.EndCall() at Microsoft.Crm.Asynchronous.EmailConnector.ExchangeIncomingEmailProviderStep.EndOperation()
Can you check by disabling the use of DHE ciphersuites from the Client SSL profile. To do so, perform the following procedure:
Impact of this Mitigation step: The impact of the following workaround will depend on the specific environment. we recommends that you test any such changes in a test environment or during a maintenance window and consider the possible impact on your specific environment.
This issue can be because of EWS endpoint is selecting DHE ciphers. Requesting you to please make sure these above steps are performed in Test environment or during a maintenance window and consider the possible impact on your specific environment.
Hope this helps.
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