Exchange Web Services - Autodiscover Issue

service.AutodiscoverUrl(email, RedirectionUrlValidationCallback);

In the Trace  output I get this...

<Trace Tag="AutodiscoverConfiguration" Tid="419" Time="2015-08-05 09:13:06Z">
Trying to call Autodiscover for mail@mysite.com on https://myserver/Autodiscover/Autodiscover.xml.</Trace>
<Trace Tag="AutodiscoverConfiguration" Tid="419" Time="2015-08-05 09:13:07Z">
No matching Autodiscover DNS SRV records were found.
</Trace>

I am not sure if autodiscover is enabled. Is there a way to set the url manually?

Thanks