Autodiscover issue Exchange 2013

I am using SBS Essentials 2012R2  with an on premise Exchange 2013 server.
Outbound and in bound mail work fine.  I using  remote.domain.com internally and externally  to get to email.
My problem is that  autodiscover does not work externally.  
I get the following error whole testing

"Validating the certificate name, Certificate name mismatch".
can anybody tel what I am doing wrong.
thombieAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
What DNS names do you have configured on your SSL UCC cert? You should have the following...
remote.domain.com
autodiscover.domain.com (if you do not have this on your cert, you are required to setup external SRV recrods on your external DNS for this).

You also need to make sure that you configure this on your 2013 CAS server.
Set-ClientAccessServer -AutoDiscoverServiceInternalUri https://remote.domain.com/Autodiscover/Autodiscover.xml

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Will.
thombieAuthor Commented:
my Godday cert is  remote.domain.com.  the internal users canconnect  vi remote.domain.com internally.  I will make sure is in place
Will SzymkowskiSenior Solution ArchitectCommented:
Yes you will need to add the autodiscover.domain.com to the UCC cert as well. If not you need to use a SRV External DNS records for autodiscover to work. Also making sure that you have configured in CAS server as well as i have illustrated in my first post.

Will.
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thombieAuthor Commented:
DO I need a seperate cert for  autodiscover.domain.com  ?
Will SzymkowskiSenior Solution ArchitectCommented:
No you do not. When Exchange you can use a UCC/SAN cert (unified communications cert) which you can add multiple names. You would add mail.domain.com and autodiscover.domain.com.

Will.

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thombieAuthor Commented:
That worked thanks sorry for the delay
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