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I am using MMC with the snaping of certificates. I am requesting certificates from a brand new installation of a CA.

Requesting User certificates works perfectly. Requesting Computer certificates fails and says the RPC service is unavailable.

What should I check?

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Do you possibly have another CA that's configured to enroll for the User template? – Shane Madden May 25 '12 at 0:37
Not, the same CA – Ricardo Polo May 29 '12 at 20:27

Personally, I'd take a network trace to see how far you get. Sounds like a permissions issue bubbling up as RPC error. might help give troubleshooting guidance.

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