Audit Failure Security Event every 10 seconds from vpxd.exe

G'day,

I am seeing this event every 10 seconds in the security event log on our vCenter Server system:

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An account failed to log on.

Subject:

    Security ID:        ELECTRO\-vCenter

    Account Name:        -vCenter

    Account Domain:        ELECTRO

    Logon ID:        0x21a39

Logon Type:            2

Account For Which Logon Failed:

    Security ID:        NULL SID

    Account Name:        TimR

    Account Domain:        ELECTRO

Failure Information:

    Failure Reason:        Unknown user name or bad password.

    Status:            0xc000006d

    Sub Status:        0xc000006a

Process Information:

    Caller Process ID:    0x850

    Caller Process Name:    C:\Program Files\VMware\Infrastructure\VirtualCenter Server\vpxd.exe

Network Information:

    Workstation Name:    SVR-VCTR01

    Source Network Address:    -

    Source Port:        -

Detailed Authentication Information:

    Logon Process:        Advapi 

    Authentication Package:    Negotiate

    Transited Services:    -

    Package Name (NTLM only):    -

    Key Length:        0

This event is generated when a logon request fails. It is generated on the computer where access was attempted.

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Is this behavior by design or what can I do to correct this?

Thanks,

Tim