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Certificate Error Exchange 2007

Posted on 2009-07-14
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Last Modified: 2012-05-07
Hi,
when I open Microsoft Outlook it returns a certificate error.  I just accept it and Outlook works fine.  But, every time I reopen it, it gives that error.  
I have a certificate named webmail.domain.com.  This certificate is used in the internet.  But the certificate's FQDN showed in Microsoft Outlook is myserver.domain.com.  "myserver" is my Exchange Server.  I just delete the certificate created in the installation of Exchange 2007 named myserver.domain.com.  What should I do?

Microsoft Exchange could not find a certificate that contains the domain name myserver.domain.com in the personal store on the local computer.  Therefore, it is unable to support STARTLS SMTP verb for the connector "Accept Relay to Applications" with a FQDN parameter of myserver.domain.com.  If the connector´s FQDN is not specified, the computer´s FQDN is used.
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Question by:anovaes
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Mestha earned 500 total points
ID: 24854780
Have you purchased a commercial SAN/UC certificate for the server?
If not then you need to.
If you have then you need to ensure that it is enabled for all the relevant services.

You cannot run Exchange 2007 without an SSL certificate of some kind.

I gone through what you need to do to get a commercial certificate on the server here:
http://blog.sembee.co.uk/archive/2008/05/30/78.aspx

Simon.
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Expert Comment

by:lastlostlast
ID: 24854783
the new certificate you are using... is it a 3rd party certificate??

Also check KB 940726... it can help you out....

let me know if you have any queries....
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Author Comment

by:anovaes
ID: 24854832
Yes.  I have a 3rd party certificate.  How can I configure exchange server to use it?  I use to access OWA.
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Expert Comment

by:Mestha
ID: 24854861
Is it a SAN/UC certificate or a single name certificate?
It is important to know because the instructions are quite different. A single name certificate is more involved because of the changes required, not only locally but also on the internet.

Simon.
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Expert Comment

by:lastlostlast
ID: 24854872
I would recommend you follow KB 940726 and set your internal URL's accoridingly....

Also make sure that in your internally, these URL's should be able to resolve...

Have a look in your internal DNS and check if the external OWA URL can be accessed internally as well...

Once you have changed the internal URL's as per KB 940726....you should no longer get the certificate prompt....
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Author Comment

by:anovaes
ID: 24864046
It's a single name certificate.
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Expert Comment

by:Mestha
ID: 24865250
I wrote an article on configuring Exchange with a single name SSL certificate.
However your external DNS provider MUST support SRV records. If they do not then you will need to replace the certificate with a SAN/UC certificate.
http://www.amset.info/exchange/singlenamessl.asp

Simon.
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Author Comment

by:anovaes
ID: 24865334
Right now, I don't want to use UC and Outlook Anywhere. just OWA.  May I just create a self-signed certificate?
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Author Comment

by:anovaes
ID: 24869486
I don't want to buy a commercial UC certificate.  It's very expensive.  I have a SSL certificate that I use with my OWA clients in the external network.  It's called webmail.domain.com.  My Exchange Server 2007 is exchange2007.domain.com.  When I try to open Microsoft Outlook 2007, it gives me a certificate error (The name on the security certificate is invalid or does not match the name of the site).  This error occurs because the certificate's name checked by Microsoft Outlook 2007 is exchange2007.domain.com instead of webmail.domain.com.  Is it possible to use my SSL certificate webmail.domain.com?  How can I do that?
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Expert Comment

by:Mestha
ID: 24870066
A UC/SAN certificate is US$60/year from a GoDaddy reseller. http://certificatesforexchange.com/ 

A self signed certificate is pointless for OWA, as every time your users connect they get a certificate prompt. Getting users used to a certificate prompt is bad practise, plus have you seen the noise IE makes when a self signed certificate is used.

SSL is not optional with Exchange 2007, and if you want to use a single name SSL certificate you have to follow the instructions I linked to above.

Simon.
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