Outlook 2010 SSL Certificate Alert

Posted on 2011-10-11
Last Modified: 2012-05-12
We recently installed an SSL certificate on our Exchange 2010 server issued by GoDaddy. However, we are getting the Security Alert popup when Outlook is opened.

The error that pops up when you open Outlook is:

"Security Alert

Information you exchange with this site cannot be viewed or changed by others. However, there is a problem with the site's security certificate.

(Green Checkmark) The security certificate is from a trusted certifying authority.

(Green Checkmark) The security certificate date is valid.

(Red X) The name of the security certificate is invalid or does match the name of the site."

The certificate is for, but we added a subject alternate name for the name of the local server and also for

However, it says it's connecting to, whereas we have it just as VM-Exchange, not the FQDN.

You can just click yes and ignore the error, but it pops up every time Outlook is launched. When I click on View Certificate and go to the Details tab, I can see under Subject Alternate Names that VM-Exchange is listed.

My thinking is the error is popping up because Outlook is connecting to and we have it added only as VM-Exchange. My colleague says this isn't the problem, but I want another opinion.

Any advice would be helpful.

Question by:Gratisites
    LVL 3

    Accepted Solution

    I think you are right.. it's trying to hit the FQDN for
    Is that for your UM server or something else?

    For the cost of adding the FQDN SAN to the cert from GoDaddy.. I would just add it in and verify if that fixes it. If it doesn't you're out like $20?

    Author Comment

    VM-Exchange is just running Exchange with the mailbox, hub transport and client access roles, we aren't using UM yet.

    It should just be a matter of rekeying the cert on GoDaddy and adding it to Exchange again. Shouldn't cost anything.
    LVL 16

    Assisted Solution

    you are only getting this certificate error on opening of outlook while your owa is working fine with the certificate.
    This is because Exchange2010 require the a certificate for following or your owa name
    your domain FQDN
    last one can be compromise but above two are highly required SAN certificate. you can issue a single certificate with multiple subjact alternative name.
    Finally you need to buy a certificate with multiple SAN to escape from this issue. you can easily create multiple SAN certificate request by using exchange certificate wizard..

    Author Comment

    Adding the SAN for on GoDaddy and rekeying the cert worked. No more errors in Outlook.

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