Outlook 2007 Security Alert, The name on the security certificate is ivalid

Posted on 2009-05-01
Last Modified: 2012-05-06
We have move from Exchange 2003 to 2007 and are having one or two teething problems.  I have intsalled a third party SSL certificate which is working well, however users are gettiing a Security Alert when connection to Outlook:

The name on the security certificate is invalid or does not match the name of the site.
Do you want to proceed?

Now I know if I had added as an alternative to the certificate, we wouldn't get this error but I didn't.  

I think there is a way to repoint the Autodiscovery to the existing SSL using:

Set-ClientAccessServer -Identity CASserver1 -AutoDiscoverServiceInternalUri

Our clients can connect to webmail internally by going to:


Does that mean that the syntax I need to use to stop this warning appearing is:

Set-ClientAccessServer -Identity CASserver1 -AutoDiscoverServiceInternalUri https://servername/owa

I just want to be sure!
Question by:-Juddy-
    LVL 24

    Expert Comment

    """Set-ClientAccessServer -Identity CASserver1 -AutoDiscoverServiceInternalUri https://servername/owa"""

    This is wrong.

    By default, AutoDiscoverServiceInternalUri will be https://casserver.domain.local/autodiscover.autodiscover.xml

    So, unless you have a SAN/UCC Certificate which has your CAS server netbios name and fqdn, along with in your cert, your error will pop up all the time.


    LVL 3

    Author Comment

    I have all of the above apart from the autodiscover entry.  
    LVL 24

    Expert Comment

    You need autodiscover entry for Outlook 2007 to work properly. Or else, use Outlook 2003 as an alternate solution.
    LVL 3

    Author Comment

    We have Office 2007 on all workstations, so I guess I'll need to alter my SSL cert.
    LVL 24

    Accepted Solution

    Yes, you need to have the in your cert. So, amend it.

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