Certificate listed as expiring, Fix my network does not work.

Have a Windows SBS 2011 server.  The certificate has this path:

InternalDomainName-Servername-CA
-|> mail.externaldomainname.com

The system is reporting that a certifcate is set to expire.  I ran the fix my network wizard as instructed and it attempted to reissue the self signed certificate and it said it was successful.  However, if you run the wizard again, it says it is expired.  I have tried rebooting the server.    The top level item in the certificate path has an expiration date of 7/21/2017 but the lower level path, mail.externaldomainname.com, does not allow its properties to be reviewed and states "This certificate has expired or is not yet valid".  It has a date of 7/21/2012-7/21/2014.  How do I get this item fixed.
cwsoft05Asked:
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David Johnson, CD, MVPOwnerCommented:
The external.com certificate is usually issued by a publc CA Authority i.e. Digicert, Godaddy, FastSSL and you will have to renew through them.  Check who issued the older certificate.
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cwsoft05Author Commented:
These are self generated certificates, not public ones.  Please note I said "self-signed" certificate above.  I found out that if I used the add a trusted certificate wizard, selected the newly created self-issued certificate it resolved the issue.
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Chris HInfrastructure ManagerCommented:
Anytime you don't use a 3rd party CA, you have to add the cert to Trusted Root CA.
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cwsoft05Author Commented:
Thanks,  since I did not setup the certificates the first time and am new to this, I did not know. I would have expected the fix my network wizard to know this and to handle it properly but it did not.
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