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mcrhodesFlag for United States of America asked on

I've upgraded to Vista and Outlook 2007 will no longer connect to exchange using http over rcp because of certificate issues

I have two laptops. One with XP Pro and Outlook 2007 and another with Vista Business and Outlook 2007. The XP machine connects to my Exchange server with no problems using http over rcp. However, my Vista machine gives me the error that the proxy server security certificate. The security certificate is not from a trusted certifying authority.
How can I resolve this?
Internet ProtocolsMicrosoft Server AppsMicrosoft Applications

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8/22/2022 - Mon

Get a certificate from a trusted authority would be the obvious answer. If you are using a self signed certificate then you should really switch to a commercial certificate. Depending on your version of Exchange, these are from US$30 to US$60 from GoDaddy. https://DomainsForExchange.net/ 


Import the certificate to your machine's trusted certificate store... if you have access or your network admins will give you the certificate for import.
If you are the network admin - export a copy from the FE/OWA server and import to the Vista pc.

Try to access OWA using the Vista machine. When you receive the certificate security prompt, you must click on 'Continue' and then click on the certificate warning box next to your address bar. Then install the certificate however you must manually choose the storage location for the certificate when prompted. This should be saved in the 'Trusted Root Certification Authorities' folder.

This process differs to XP, which automatically stores the certificate in the correct place. In Vista it appears that you have to manually stipulate where to save the certificate. This worked for me when I encountered the same issue, using a self-signed certificate (not absolutely necessary to acquire a 3rd-party certificate). It works like a dream on all Vista machines now.
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James Murphy

I've tried to import the certificate into the Trusted Root Certificate Authorities but I still get the message that the signer was not issued by a trusted certificate autorization. I do want to avoid paying a yearly fee on a certificate. Does anyone know of another plan?

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While I appreciate that you don't want to buy a certificate - how much is your time worth? With a commercial certificate I can have this feature working in less than 30 minutes. With a self generated certificate I have spent hours trying to get it to work. Now I have other things to do with my time than trying to get a "free" solution to work.


Commercial certs from an inexpensive seller - like GoDaddy - are as low as $40 / year. That's hard to beat in terms of your time.
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The link you sent helped. Thanks