Onde encontro o significado dos números TdsInputBufferError?

Estamos tendo alguns erros de conexão esporádicos em alguns de nossos servidores SQL. Fiz algumas pesquisas e descobri o Ring Buffer no SQL 2008 R2 e encontrei algumas informações, mas não tenho certeza de como descobrir.

Executando a consulta

SELECT  CAST(record AS XML)
FROM    sys.dm_os_ring_buffers
WHERE   ring_buffer_type = 'RING_BUFFER_CONNECTIVITY'

Dá-me alguns resultados, dos quais é interessante

<Record id="4" type="RING_BUFFER_CONNECTIVITY" time="461419385">
  <ConnectivityTraceRecord>
    <RecordType>LoginTimers</RecordType>
    <Spid>0</Spid>
    <SniConnectionId>40A403B2-B860-4877-A1D3-1FA7024356B7</SniConnectionId>
    <SniConsumerError>17830</SniConsumerError>
    <SniProvider>4</SniProvider>
    <State>11</State>
    <RemoteHost>&lt;local machine&gt;</RemoteHost>
    <RemotePort>0</RemotePort>
    <LocalHost />
    <LocalPort>0</LocalPort>
    <RecordTime>5/19/2012 16:29:23.831</RecordTime>
    <TdsBuffersInformation>
      <TdsInputBufferError>109</TdsInputBufferError>
      <TdsOutputBufferError>0</TdsOutputBufferError>
      <TdsInputBufferBytes>0</TdsInputBufferBytes>
    </TdsBuffersInformation>
    <LoginTimers>
      <TotalLoginTimeInMilliseconds>18010</TotalLoginTimeInMilliseconds>
      <LoginTaskEnqueuedInMilliseconds>0</LoginTaskEnqueuedInMilliseconds>
      <NetworkWritesInMilliseconds>0</NetworkWritesInMilliseconds>
      <NetworkReadsInMilliseconds>18010</NetworkReadsInMilliseconds>
      <SslProcessingInMilliseconds>0</SslProcessingInMilliseconds>
      <SspiProcessingInMilliseconds>0</SspiProcessingInMilliseconds>
      <LoginTriggerAndResourceGovernorProcessingInMilliseconds>0</LoginTriggerAndResourceGovernorProcessingInMilliseconds>
    </LoginTimers>
  </ConnectivityTraceRecord>
  <Stack>...</Stack>
</Record>

Portanto, minha pergunta é: onde encontro o significado dos números de erro do TDS. Nesse caso<TdsInputBufferError>109</TdsInputBufferError>