Microsoft Remote Connectivity Analyser

We have an Exchange Server we want to move to Office 365. There is a front-end and back-end server. When I run the Microsoft Remote Connectivity Analyser (Connectivity Test) we get the following message:

Attempting to ping RPC proxy webmail.domain.com.
       RPC Proxy can't be pinged.
       
      Additional Details
       
An unexpected network-level exception was encountered. Exception details:
Message: The remote server returned an error: (500) Internal Server Error.
Type: Microsoft.Exchange.Tools.ExRca.Extensions.MapiTransportException
Stack trace:
at Microsoft.Exchange.Tools.ExRca.Extensions.MapiRpcTestClient.PingProtocolProxy(String endpointIdentifier)
at Microsoft.Exchange.Tools.ExRca.Tests.MapiPingProxyTest.PerformTestReally()
Exception details:
Message: The remote server returned an error: (500) Internal Server Error.
Type: System.Net.WebException
Stack trace:
at System.Net.HttpWebRequest.GetResponse()
at RpcPingLib.RpcPing.PingProxy(String internalServerFqdn, String endpoint)
at Microsoft.Exchange.Tools.ExRca.Extensions.MapiRpcTestClient.PingProtocolProxy(String endpointIdentifier)
Elapsed Time: 556 ms.

Any suggestions to what this relates to:
mail2clkAsked:
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Randy DownsOWNERCommented:
Maybe this will help. They were having issues with Exchange 2007 mailboxes but it worked Ok on 2013. Eventually he gave up on fixing this "error"

I can telnet the Exchange server on port 6004. In fact, I can telnet all Exchange servers on that port.

I should add that we are in the process of migrating users from a 2007 to a 2013 server. The test I originally posted was for 2007 mailbox. If I test Outlook connectivity for a 2013 server mailbox then it works fine, so it looks like a 2007 issue.

The Exchange 2007 server in question only has one IPV4 address on the LAN adaptor.


No resolution, although I don't think it's causing any problems. I just don't like the official Microsoft tool telling me there's a problem
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mail2clkAuthor Commented:
I did some configuration and I am now receiving the error. Does anyone have any suggestions to overcome this issue?

Testing the address book "Check Name" operation for user user@domain.com against server our-exchange.
       An error occurred while attempting to resolve the name.
       
      Additional Details
       
An RPC error was thrown by the RPC Runtime process. Error 1717 UnknownIf
Elapsed Time: 1577 ms.
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Windows Server 2003

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