Exchange 2010 Hybrid Migration to Office 365.

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New Contributor

Hi Guys!

I seem to have a big problem with migrating on premise Exchange 2010 mail accounts over to Office 365 tenant. I have logged this with Microsoft multiple times, and not really getting anywhere - I keep been sent back and forwards between the On prem and O365 team... I will provide all steps taken and config below: 

 

Server Config:

Windows SBS 2008 R2, SP1

Exchange 2010

Steps done:

Verified the Office 365 txt record for the domain.

Configured AD sync, so mailboxes are appearing in the 365 portal.

Issue at hand:

When trying to run the Office Hybrid Migration Wizard, it errors at the end every time. I fill in all the correct details, step by step and get the following:

-The connection to the server "x" could not be completed. EWS/Mrsproxy.svc failed.

-Error details could not establish trust relationship for the SSL/TLS secure channel.

Steps advised and taken to try resolve:

-Server Reboot 

-Try create endpoint in Office 365 portal manually *Fails

-Enabled MRS proxy through power shell 

-Restarted IIS 

Additional Info: 

-A PST restore is just not feasible, there is around 20 mailboxes all 30-40GB

-Can browse to EWS/OWA Pages externally

-Server has self signed certificates

 

Any help with this would be greatly appreciated.

 

C

3 Replies
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Hi @chuns2000,

 

You will need a valid Public certificate to implement hybrid.

 

Please read more here https://docs.microsoft.com/en-us/exchange/hybrid-deployment-prerequisites

 

Best Regards,
Nuno Árias Silva 

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@chuns2000, if you are using a public certificate, the problem probably could be a firewall SSL inspection or a proxy.

 

Best Regards

 

Have a nice day

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@Nuno Silva Thanks, I will import a public cert and go from there. I will let you know if it works.