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Event ID: 2152 Source: MSExchangeADAccess

Process <process name> (PID=<pid>). An remote procedure call (RPC) request to the Microsoft Exchange Active Directory Topology service failed with error <error code> (<error description>). Make sure that the Remote Procedure Call (RPC) service is running. In addition, make sure that the network ports that are used by RPC are not blocked by a firewall.
As per Microsoft: "This event may occur if the RPC service is stopped or disabled. This event may also occur if the ports that are used by the RPC service are blocked by a firewall". See the link to "EventID 2152 from source MSExchangeADAccess" and MSEX2K3DB for information on fixing this problem.

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