JerN If I get a resolution I'll post an update. That means that the credentials , my code and everything else is correct. http://msdn.microsoft.com/en-us/library/exchange/dd633676(v=exchg.80).aspx. The Microsoft Connectivity Analyzer failed to obtain an Autodiscover XML response Previous Versions of Exchange Exchange Previous Versions - Extended Components, Tools, and Utilities I had a path for "/autodiscover/autodiscover.xml" in the rule and this allowed it to work with Android or Outlook. Until last last Wednesday I was able to work and loop through the users without problem. Thanks, Jordan.  in the Service.URL did the trick. What you could try to do as a test is use Impersonation Is it something that I need to look for ?Or change in my code ? An HTTP 401 Unauthorized response was received from the remote Unknown server. This thread is locked. Actually I have application which is use to transfer email to office 365 of any account in Office 365. I'm having issues with autodiscover. The Microsoft Connectivity Analyzer failed to obtain an Autodiscover XML response. This is usually the result of an incorrect username or password. Something is not being setup correctly ?. devices have this issue, IOS 10/11/12? but I can Login to OWA with this username and password ! Hello , I have the same scenario with "The Autodiscover service couldn't be located.". didn't link the external IP address with the Autodiscover Service ? The problem is that after the second user if I do this in one loop the cloud kind of Locks ??? However this may or may not change in the future. The certificate couldn't be validated because SSL negotiation wasn't successful. Putting the https://outlook.office365.com/ews/exchange.asmx  Here is a strange thing that is happening.         Catch ex As AutodiscoverRemoteException Check some Thanks for your reply. Additional Details An HTTP 500 response was returned from Unknown. So I use the address like you mention above (" https://outlook.office365.com/ews/exchange.asmx ") Your webhosting provider probably uses Apache... you should talk to them. HEllo , I have done several tests with ewseditor , and it worked at my machine but it did not work on the customer's I turned off the SCP Lookup and gave me the same error as following. The Microsoft Connectivity Analyzer failed to obtain an Autodiscover XML response.-----I can provide more info through an IM, are you guys able to help here? Is there any difference in it? Yes but are you able to hit that from -outside- your network. I'm not sure why it's failing the MS analyzer and why it works with some devices but not iOS. you do some testing at the customer site with the EWSeditor Hi Glen I fall in the same issue. If they are using Hybrid mode  eg some OnPrem and some cloud mailboxes you may also be having issue. even when I try to use their credentials I manage to connect to their calendar , but they cannot .             Throw ex I'm only having one connection each time. That will tell you where the Autodiscover requests are going and what's going wrong. Path-specific routing in the firewall rules are case sensitive. connect. http://msdn.microsoft.com/en-us/library/exchange/gg194012%28v=exchg.140%29.aspx, this will mean the throttling budget of the mailbox your accessing will be charged rather then the service account your using. What trace files do you want me to send you ? I've reached out to Sophos to see if they can provide some assistance as the rules are setup according to their documentation. It depends on your code if you are using the Managed API in its default mode it will perform a lookup of Active Directory first to find any Exchange installations for that domain first and then it will try DNS. AutoDiscovery Or Giving URL Directly. Currently no all you will get back from AutoDiscover in Office365/EXO is The Microsoft Connectivity Analyzer is attempting to retrieve an XML Autodiscover response from URL https://webmail.My.com/autodiscover/Autodiscover.xml for user MyUserEmail. Note that by default, Outlook 2016 will first check if the domain is registered with Office 365. This topic has been locked by an administrator and is no longer open for commenting. In other words , business as usual. I need help why AutoDiscover not working. Private Shared Function RedirectionUrlValidationCallback(ByVal redirectionUrl As String) As Boolean Server: Microsoft-IIS/8.0     End Function, ' Create the callback to validate the redirection URL. Correct ?Then I'm taking the other user ,  connecting to the cloud , reading inbox, sent items etc etc. To continue this discussion, please https://www.testexchangeconnectivity.com/ (use the Office365 Tab), The next thing would be to enable Tracing and look at the Autodiscover Traces to see where its failing I have a suspicion that the "Cloud" sees that after the second user someone is trying to hack it ???? I'm connecting one time ,  reading the inbox for one user (all the messages) , the sent items folder and then I set the MyExchangeService variable to null. If you are attempting to log onto an Office 365 service, ensure you are using your full User Principal Name (UPN). Are you using the same accout in other applications >> Is there any difference in it? I'm not sure why the webserver my webhosting provider is using would be relevant. Have you tried using https://testconnectivity.microsoft.com/ with that user to do some testing ? The Microsoft Connectivity Analyzer failed to obtain an Autodiscover XML response. AutoDicovery Or Giving URL Directly. That's what the Microsoft tool is checking and is reporting an Apache server so I suspect either your autodiscover record in your EXTERNAL DNS is pointing to the wrong location or your Sophos is doing something weird.

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