problem to renewing certificate exchange 2010

Hello guys, i have this problem: my Exchange certificate is expired and when i try renew it the file *.req created is unreadable (ex: ¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿).
Then i try to create a new certificate - i generated the file req from this site: https://www.digicert.com/easy-csr/exchange2010.htm
After finished the procedure and i assigned the roles at the new certificate i have another problem. Outlook in RPC mode doesn't work, the error is: Unable to connect to the proxy server error code 8.

can anyone help me?

Regards
r3helpdeskAsked:
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Nick RhodeIT DirectorCommented:
Assuming you generated the new CSR, uploaded it to digicert, completed the request with the new cert downloaded and assigned the servces required to the new certificate.

Did you do a restart of IIS?  open up the run command and type: iisreset /noforce
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r3helpdeskAuthor Commented:
Yes it's correct.
From internal lan Outlook is ok, but in RPC mode is disconnected.
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Nick RhodeIT DirectorCommented:
check here to validate RPC:  http://support.microsoft.com/kb/923575

Also check if the service is running
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r3helpdeskAuthor Commented:
Ok, it worked after i installed the certificate in the correct path in my pc. Thank you for your support.
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