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Exchange Security Certifcate - Client getting error message

I have a user on our domain and subnet that is getting an error messge every time she opens Outlook, 'Information you exchange with this site cannot be viewd or changed by others. However, there is problem with the site's security certificate.' There is an X by this line, 'The name on the security cerficate is invalid or does not match the name of the site'.
I have installed the certificate numerous times and I still get this pop up from autodiscover.mydomain.com.

SOLUTION

jdera

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WRAR-Admin

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The issue is on one PC, on the local domain and only when opening Outlook 2007. There are no issues with any web sites. It is oonly when the Oultook client attempts to connect to Exchange 2003 on the network and it is the only computer on the network that has this issue...
Attempts to install the certificate have not resulted in any added success.

UPDATE: Even thought the network is handing out DHCP (COrrectly) and handing out DNS, when I looked at the cert. error it was autodiscover+domain.com.. SO apparently DNS is not being handed out correctly from the DNS server... Where is the besty place on the server side (Server 2003R2) to begin the trouble shooting process of why DCHP is correct but DNS is funky... When I statically entered the DNS server IP address in the PC's DNS NIC entry field, the certificate problem went away.. All PCs on the network have the DNS IP manually entered so apparently the issue MUST be with the DNS server...

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jdera

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