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auto-enroll using existing certificate

Hello, we are configuring routers to use Windows PKI for VPN purposes.

Now routers enroll certificates using one time passwords, recieved from NDES service, and valid for 60 min. In this case we have a problem with auto enrollement, because before each auto-enrollement procedure, administrator have to visit NDES web page, recive a password and put it into config. We dont know when exactly next auto-enrollement will occur. We may configure NDES to use one password that never expires for all routers, but it's not very secure.

So we want routers to sign their requests to CA with their existing certificates, is it possible?

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