Receiving Connection_Abandoned_By_AppPoo and Connection_Dropped Errors in Web server IIS logs [Answered]RSS

1 reply

Last post Mar 31, 2013 12:27 AM by lextm

  • Receiving Connection_Abandoned_By_AppPoo and Connection_Dropped Errors in Web server IIS logs

    Mar 30, 2013 11:33 PM|nukunu|LINK

    Hello, we have about 10 web servers fetching data from Flexcube Oracle Database. We are running on Windows 2003 Server Service Pack 2. For the last past weeks we have been experiencing slow performance on the Web pages, sometimes the connection is refused. We drilled down to the iis http error logs and found out that, we had so many errors. Which I have summarized / pasted below.

    HTTP/1.1    POST    /flexbranch/conn.asp?statflg=what    -    1    Connection_Dropped    DefaultAppPool
    HTTP/1.1    POST    /flexbranch/conn.asp?statflg=what    -    1    Connection_Dropped    DefaultAppPool
    HTTP/1.1    POST    /flexbranch/conn.asp?statflg=what    -    1    Connection_Dropped    DefaultAppPool
    HTTP/1.1    POST    /flexbranch/conn.asp?statflg=what    -    1    Connection_Dropped    DefaultAppPool
    HTTP/1.1    POST    /flexbranch/conn.asp?statflg=what    -    1    Connection_Dropped    DefaultAppPool

    HTTP/1.1    POST    /flexbranch/conn.asp?statflg=what    -    1    Connection_Abandoned_By_AppPool    DefaultAppPool
    HTTP/1.1    POST    /flexbranch/FormRequest.asp    -    1    Connection_Abandoned_By_AppPool    DefaultAppPool
    HTTP/1.1    POST    /flexbranch/TPValidatorService.asp    -    1    Connection_Abandoned_By_AppPool    DefaultAppPool
    HTTP/1.1    POST    /flexbranch/conn.asp?statflg=what    -    1    Connection_Abandoned_By_AppPool    DefaultAppPool.

    Getting HTTP error code 503 too.

    I have researched the internet and saw some articles on the asp crashes. I need some information on how to troubleshoot these errors, since web transactions from client systems never complete due to this connection issue. 

    Thank you.

  • Re: Receiving Connection_Abandoned_By_AppPoo and Connection_Dropped Errors in Web server IIS logs

    Mar 31, 2013 12:27 AM|lextm|LINK

    Connection_Dropped means the web browser/client closed the HTTP connection, which is usually caused by client side timeout.

    Connection_Abandoned_By_AppPool means the IIS worker process closed the connection, which can occur when the worker process crashed, or application pool recycled.

    503 means service unavailable, which comes when application pool recycled or worker process crashed.

    So based on such information, there might be no significant issue with the IIS server.

    However, you do mention that the web application becomes slow. If it is slow enough, the Connection_Dropped is expected, as the client side might time out often. But to explain Connection_Abandoned_By_AppPool and 503, you need to check Windows event log to see whether someone recycled the pool, or the worker process crashed.

    To troubleshoot slow performance, unless you are the developer and good at debugging, I recommend you open a support case via http://support.microsoft.com to consult Microsoft support team. Though using a proper profiler or dump analysis can easily tell the culprit, you won't be a master of the skills in a short period of time.

    Lex Li
    Affordable IIS Consulting Services at https://support.lextudio.com/services/consulting.html
    ---------------------------
    This posting is provided "AS IS" with no warranties, and confers no rights.