When importing a certificate into the Exchange Management Console you may get the error
The certificate status could not be determined because the revocation check failed.
This occurs when Exchange uses WinHTTP to manage all HTTP and HTTPS connections. You may have configured a proxy in the browser but this is not used by WinHTTP.
You must configure WinHTTP proxy settings. To do this run the following command on the server.
netsh winhttp set proxy proxy-server="http=<span class="sbody-strong">proxy_name</span>" bypass-list="*.<span class="sbody-strong">domain_name.com</span>"
Where proxy_name is the name of your proxy server and domain_name.com is the Exchange Server host name.