Trying to configure a client's network for RPC over HTTP, I manage to get my own Vista laptop to synchronize. However, in the process I ran into an error:
"Microsoft Office Outlook : There is a problem with the proxy server's security certificate.
The security certificate is not from a trusted certifying authority. Outlook is unable to connect to the proxy server <server_name>.<domain_name
>.co.uk. (Error Code 18)."
This seemed to stop me connecting. I played with the settings, re-installed the certificate and then noticed that it no longer prompts with this error - it just works.
So, I move on to configure the same user account on one of the client's laptops. Problem is, I'm now getting that error again and I can't seem to get rid of it. I've noticed that Outlook will still synchronize, but I'm not sure if this is because it is physically connected to the LAN where the server resides.
The certificate does appear to be installed correctly. It appears in the trusted root certificates list and like I say, it does actually work apart from this message popping up each time the user loads Outlook.
Any ideas why I'm getting the error, or what I can do to get rid of it? Also, is it only working because that machine is on-site and connected via the LAN?
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