The autoenrollment functionality fails when a Windows Vista-based computer uses version 2 (V2) certificates. Additionally, an event that resembles the following is logged in the Application log:

Log Name: Application
Source: Microsoft-Windows-CertificateServicesClient-CertEnroll
Date: Date
Event ID: 13
Task Category: None
Level: Error
Keywords: Classic
User: User SID
Computer: Computer Name
Description:
Certificate enrollment for Local system failed to enroll a template certificate from certification authority. (The RPC server is unavailable. 0x800706ba. (Win32:1722))

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To resolve this problem, follow these steps:

1.	On the domain controller that hosts the certification authority, verify that the CERTSVC_DCOM_ACCESS group exists. To do this, follow these steps on the domain controller: a. Click Start, click Run, type Dsa.msc, and then click OK. b. In the console tree, click Users. c. In the details pane, verify that the CERTSVC_DCOM_ACCESS group exists.
2.	Add following groups to the CERTSVC_DCOM_ACCESS group: • The Domain Users group • The Domain Computers group • The Domain Controllers group
3.	To update the DCOM security settings for the certificate service, run the following commands at a command prompt: certutil -setreg SetupStatus -SETUP_DCOM_SECURITY_UPDATED_FLAG net stop certsvc net start certsvc Note Press ENTER after each command.

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The CERTSVC_DCOM_ACCESS group is created after you install Windows Server 2003 Service Pack 1 (SP1) on the domain controller. By default, the Domain Users group and the Domain Computers group reside in the CERTSVC_DCOM_ACCESS group.

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Network trace

When this problem occurs, a network trace that resembles the following is generated:

No.     Time        Source                Destination           Protocol Info
     10 0.042104    <Source IP address> <Destination IP address>           DCERPC   Fault: call_id: 2 ctx_id: 1 status: nca_s_fault_access_denied

Frame 10 (86 bytes on wire, 86 bytes captured)
Ethernet II, Src: <Source MAC address>, Dst: <Destination MAC address>
Internet Protocol, Src: <Source IP address>, Dst: <Destination IP address>
Transmission Control Protocol, Src Port: <Source Port>, Dst Port: <Destination Port>, Seq: 286, Ack: 2554, Len: 32
DCE RPC Fault, Fragment: Single, FragLen: 32, Call: 2, [Req: #9]
    Version: 5
    Version (minor): 0
    Packet type: Fault (3)
    Packet Flags: 0x03
        0... .... = Object: Not set
        .0.. .... = Maybe: Not set
        ..0. .... = Did Not Execute: Not set
        ...0 .... = Multiplex: Not set
        .... 0... = Reserved: Not set
        .... .0.. = Cancel Pending: Not set
        .... ..1. = Last Frag: Set
        .... ...1 = First Frag: Set
    Data Representation: 10000000
        Byte order: Little-endian (1)
        Character: ASCII (0)
        Floating-point: IEEE (0)
    Frag Length: 32
    Auth Length: 0
    Call ID: 2
    Alloc hint: 32
    Context ID: 1
    Cancel count: 0
    Status: nca_s_fault_access_denied (0x00000005)
    Opnum: 4
    [Request in frame: 9]
    [Time from request: 0.000724000 seconds]

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