troubleshooting Question

CONNECTIVITY TEST FAILED: Testing RPC over HTTP connectivity to server (Exchange Online)

Avatar of Damian Gardner
Damian Gardner asked on
ExchangeOutlookMicrosoft 365Email ServersCloud Computing
13 Comments1 Solution1635 ViewsLast Modified:
CONNECTIVITY TEST FAILED:  Testing RPC over HTTP connectivity to server
       RPC over HTTP connectivity failed.

We're in process of preparing to migrate our Exchange 2010 email server to the Microsoft Cloud, and we're getting this error when we do a connectivity test.  We have our SSL cert in place, and we've opened the required ports (TCP/UDP 6000-6004) on our firewall, as well as verified 443 is open.  In spite of this, we get this error above.  I'm looking for anyone who has maybe experienced this same error and worked thru it.  I did find this suggestion online, but am not sure if I need to mess with my server's "External Hostname".  I found it on Technet:

"The ExRCA tool will check the connection by external settings in Exchange.
And, I suppose that the host name of Outlook Anywhere, run "Get-OutlookAnywhere | FL Identity,*Host*" to check it.

If the ExternalHostName is server.domain.local, change it to and retest ExRCA again. "

Anybody try this with good results?

Thanks for your help.
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