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After completing the certificate request in Exchange 2010,  the status section shows:

"The certificate status could not be determined because the revocation check failed"

The certificate cannot be assigned to the website.


This issue occurs because Exchange Server 2010 uses Microsoft Windows HTTP Services (WinHTTP) to manage all HTTP and HTTPS traffic, and WinHTTP does not use the proxy settings which are configured for the Internet browser. 


Follow these steps to resolve this issue:

1. In order to view the WinHTTP proxy settings, at a command prompt, please run the following command:

               netsh winhttp show proxy

You must configure the WinHTTP proxy setting and the server FQDN in the WinHTTP bypass list.

Note: So that Exchange Management Shell and the Exchange Management Console can contact the Remote PowerShell, you should both configure the proxy setting and the server FQDN in the WinHTTP bypass list. 

2. Then open a command prompt, type the following command, and press ENTER:

               netsh winhttp set proxy proxy-server="http=myproxy" bypass-list="*.host_name.com"

The myproxy placeholder represents the proxy server name, and host_name the Exchange Server 2010 host name.Run the following commands to clear the OCSP/CRL cache, if the proxy settings are correct, and it still doesn't work:
               certutil -urlcache ocsp delete
               certutil -urlcache crl delete

Note: You must reboot the server if required.

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