For Classic hybrid, pre-authentication for EWS / Autodiscover virtual directories is not supported.For Classic hybrid – where we require inbound connectivity from Exchange Online to on-premises Exchange, allow all Exchange Online IP addresses to connect to on-premises EWS / Autodiscover.SSL offloading is not supported for MRSProxy.Load-balancing Exchange 2010 MRSproxy servers requires IP persistence (affinity).On-premises migration Admin needs to have the minimum required permissions and valid credentials.Exchange Online requires Negotiate (NTLM) authentication for MRSProxy.
MRSproxy needs to be enabled and running in Exchange on-premises.TLS1.2 should be enabled in the on-premises infrastructure.Now let’s cover some troubleshooting! Things that are commonly mis-configuredīefore getting to the part where we troubleshoot specific migration endpoint issues, be aware of the following top reasons why a migration endpoint cannot be created:
Note that this post has some in-depth troubleshooting steps, so it is not necessarily something that you’ll read for fun, but we wanted to make it available for those times when you run into trouble! In this post, we will cover related troubleshooting.
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In our previous blog post we covered an overview of what migration endpoints are, how to find them and what makes them tick.
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