Hi
As the title says, I have an Exchange 2013 server configured for Office 365 in Hybrid mode.
When interrogating Free Busy information of an online mailbox via an on premises Outlook client, I get the following Error on the Exchange 2013 server.
Process Microsoft.Exchange.InfoWorker.Common.Delayed`1[System.String]: <.mail.onmicrosoft.com>SMTP:taccount-1@<mydomain>.mail.onmicrosoft.com">taccount-1@<mydomain>.mail.onmicrosoft.com>SMTP:taccount-1@<mydomain>.mail.onmicrosoft.com
with error System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.EndInvoke(IAsyncResult asyncResult)
at Microsoft.Exchange.SoapWebClient.AutoDiscover.DefaultBinding_Autodiscover.EndGetUserSettings(IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.UserSoapAutoDiscoverRequest.EndGetSettings(IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.SoapAutoDiscoverRequest.<>c__DisplayClass4.<EndInvoke>b__3()
at Microsoft.Exchange.InfoWorker.Common.Availability.SoapAutoDiscoverRequest.ExecuteAndHandleException(ExecuteAndHandleExceptionDelegate operation). ---> System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.EndInvoke(IAsyncResult asyncResult)
at Microsoft.Exchange.SoapWebClient.AutoDiscover.DefaultBinding_Autodiscover.EndGetUserSettings(IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.UserSoapAutoDiscoverRequest.EndGetSettings(IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.SoapAutoDiscoverRequest.<>c__DisplayClass4.<EndInvoke>b__3()
at Microsoft.Exchange.InfoWorker.Common.Availability.SoapAutoDiscoverRequest.ExecuteAndHandleException(ExecuteAndHandleExceptionDelegate operation)
--- End of inner exception stack trace ---
. Name of the server where exception originated: EXSERVER-2. This event may occur when the Mailtips application cannot discover a corresponding application in the remote forest.
I have tried everything. All federation and organization tests work as expected. They show the tokens being requested and successfully delivered to and from the on premises and online endpoints. In short, I'm almost completely sure I have the hybrid mode configured correctly - as every thing else (all mail flow etc.) works. But what is causing this error message and stopping free/busy information in one direction?
All help much appreciated.
Andrew