Have you seen http://social.technet.microsoft.com/wiki/contents/articles/13130.ad-rms-troubleshooting-guide.aspx ?
"Most likely there is an untrusted certificate or a certificate revocation list (CRL) cannot be resolved. If
there are any warnings when using Internet Explorer to browse and access the AD RMS "pipeline" URLs , then Office applications will fail to be able to contact the AD RMS server"
You can fix the certificate/CDP or as described on the same website:
"you can as a workaround for CRL issues, disable CRL checking in Internet Explorer. To disable CRL checking, in
Internet Explorer, from the Tools menu,
open Internet Options,
click the Advanced tab,
scroll to the Security section
and uncheck the box for Warn about security address mismatch,
and then click OK."
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