Exchange 2016 error updating busy

Before configuring your hybrid deployment, verify that your on-premises network and security configuration can support the features and components in the table below.In addition to allowing specific inbound protocols, ports, and endpoints, computers on your network also need to be able to access the IP addresses, ports, and URLs listed in Office 365 URLs and IP address ranges.This test sometimes passes but most times fails with the following: Hoping for clarity I went to the Event Viewer on the new Exchange server and filtered on MSExchange Availability as source, with a level of 'Error'.Returned are a number of Events with an ID of 4013.If you change the DNS record for your client access namespace, all of your users will begin making connections for some Exchange services to the Exchange 2016 server.If there's a problem, it will impact all of the users.Summary: What your Exchange environment needs before you can set up a hybrid deployment.

I have spent roughly a week researching the issue and most proposed fixes that have worked for others (mostly autodiscover re-configuration) have not cleared this up in my case.To avoid an unexpected problem, it's advisable to test the client access change before you modify the DNS record.To perform this test you can use a hosts file entry on a test workstation, to point that single client's connections to the Exchange 2016 server.The following command will display the Outlook Anywhere configuration for Exchange 2010 servers.Get-Exchange Server | Where | Get-Outlook Anywhere | fl servername,externalhostname,*auth* Server Name : NREXCH10 External Hostname : mail.External Client Authentication Method : Ntlm Internal Client Authentication Method : Ntlm IISAuthentication Methods : If you have a different logon format requirement you should make those changes to the virtual directory settings now before you cut over any namespaces or move any mailboxes.

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You can follow the steps outlined in this article to modify the hosts file.

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