ActiveSync Autodiscover not working

Question

When testing autodiscover for activesync I get the following error: 
An error message was returned from the Autodiscover service
XML response:
<?xml version="1.0"?>
<Autodiscover xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/mobilesync/responseschema/2006">
<Culture>en:us</Culture>
<Action>
<Error>
<Status>1</Status>
<Message>No external URL is available to access this mailbox with Exchange ActiveSync. Your Exchange server configuration needs to be changed to allow access.</Message>
<DebugData>UserMailbox</DebugData>
</Error>
</Action>
</Response>
I've confirmed that my external url is set correctly. I've found some other comments about it being a corrupt setting in web.config and I've tried that as well. Still get
the same error. Any ideas? 

Answer 1

Hi Scott
Looks like the issue might be due to DNS or srv record not configured correctly.
Ensure that you have autodiscover,activesync entry on the SAN certificate.
Ensure that Internal URL & External URL of EWS , OAB should match entries on SAN.
Also you can cross verify if the external url is set correctly if you have multiple sites.
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