Hi,
Running Enterprise Edition, 4 Node Cluster. SQL 2008 R2 Sp1+CU4.
Seeing widespread but intermittent Login Timeouts from client processes. Nothing reported in SQL Errorlogs, Windows Event Logs or network switch logs. These issues are intermittent but occur a couple of times per day. Have spent time upgrading firmware on network switches etc but these issues endure.
The only thing I really see server side is in the ring buffer. I see bursts of LoginTimers events, perhaps 60-70 at a time. They all have SniConsumerError=17830, and TdsInputBufferError=10054. Not ruling out further network issues, but would appreciate any pointers.
From sys.messages: 17830: Network error code 0x%x occurred while establishing a connection; the connection has been closed. This may have been caused by client or server login timeout expiration. Time spent during login: total %d ms, enqueued %d ms, network writes %d ms, network reads %d ms, establishing SSL %d ms, negotiating SSPI %d ms, validating login %d ms, including user-defined login processing %d ms.%.*ls
10054: Connection reset by peer. [NT only]
From KBArticle: This can happen if a sockets client (which includes SPX) is actively sending or receiving data to or from SQL Server, and the network connection is lost. This error is usually seen in conjunction with error 17824 when on sockets-based connections. For example, an Microsoft Windows NT client using the NWLink SPX transport could be selecting data from SQL Server, and if the network cable is unplugged from the SQL Server computer, you will see error 10054.
Here is an example of the xml from the ring buffer:
<Record id="231" type="RING_BUFFER_CONNECTIVITY" time="1094487444">
<ConnectivityTraceRecord>
<RecordType>LoginTimers</RecordType>
<Spid>0</Spid>
<SniConnectionId>ADD632AE-4D3D-4076-A71E-9C853F0CAA72</SniConnectionId>
<SniConsumerError>17830</SniConsumerError>
<SniProvider>7</SniProvider>
<State>11</State>
<RemoteHost>10.10.66.49</RemoteHost>
<RemotePort>55844</RemotePort>
<LocalHost>10.10.64.16</LocalHost>
<LocalPort>54436</LocalPort>
<RecordTime>3/5/2012 14:30:21.228</RecordTime>
<TdsBuffersInformation>
<TdsInputBufferError>10054</TdsInputBufferError>
<TdsOutputBufferError>0</TdsOutputBufferError>
<TdsInputBufferBytes>0</TdsInputBufferBytes>
</TdsBuffersInformation>
<LoginTimers>
<TotalLoginTimeInMilliseconds>83</TotalLoginTimeInMilliseconds>
<LoginTaskEnqueuedInMilliseconds>44</LoginTaskEnqueuedInMilliseconds>
<NetworkWritesInMilliseconds>35</NetworkWritesInMilliseconds>
<NetworkReadsInMilliseconds>3</NetworkReadsInMilliseconds>
<SslProcessingInMilliseconds>57</SslProcessingInMilliseconds>
<SspiProcessingInMilliseconds>0</SspiProcessingInMilliseconds>
<LoginTriggerAndResourceGovernorProcessingInMilliseconds>0</LoginTriggerAndResourceGovernorProcessingInMilliseconds>
</LoginTimers>
</ConnectivityTraceRecord>
<Stack>
<frame id="0">0X0000000001570EBB</frame>
<frame id="1">0X000000000156DCA6</frame>
<frame id="2">0X000000000157292E</frame>
<frame id="3">0X0000000000829A94</frame>
<frame id="4">0X000000000021A8A8</frame>
<frame id="5">0X00000000001DF070</frame>
<frame id="6">0X00000000001DEE46</frame>
<frame id="7">0X00000000001DEC8B</frame>
<frame id="8">0X00000000007A923A</frame>
<frame id="9">0X00000000007A9389</frame>
<frame id="10">0X00000000007A7201</frame>
<frame id="11">0X00000000007A8402</frame>
<frame id="12">0X00000000747437D7</frame>
<frame id="13">0X0000000074743894</frame>
<frame id="14">0X000000007710652D</frame>
<frame id="15">0X000000007733C521</frame>
</Stack>
</Record>