Domain Controller not communicating with Exchange Server

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    I just inherited this site to support.

    I have 2 2008 DC’s primary is fine

    Secondary is acting wierd; it is the secondary DNS as well. I double checked the the DNS is point to itself as primary. i confirmed both servers are in AD domain ctrl OU.
    pc-mail-02 is the exchange server

    These are the events I am getting on the secondary DC. They other day when I rebooted DC 1 and the exchange server the exch serv wouldnt come back before DC1

    Errors I get twice a day.
    DCOM was unable to communicate with the computer using any of the configured protocols. event 10009

    Automatic certificate enrollment for local system failed (0x800706ba) The RPC server is unavailable. event 6

    Certificate enrollment for Local system failed to enroll for a DomainController certificate with request ID N/A from (The RPC server is unavailable. 0x800706ba (WIN32: 1722)). event 13

    Any advice or suggestions would be most appreciated.


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