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TCP connection in IS pub.client:http - Resending HTTP request on TCP [RST,ACK] packet, which has already been sent to Target

  • 1.  TCP connection in IS pub.client:http - Resending HTTP request on TCP [RST,ACK] packet, which has already been sent to Target

    Posted Mon June 20, 2022 05:23 AM

    Hi Experts,

    Let me explain what we faced or observing during IS send http request to target :

    • Consider there will be a healthy TCP connection socket opened for example 12345 from IS to the target system to send HTTP requests.
    • After target system reaches its idle timeout, it will request to close this TCP socket connection 12345 (issues FIN,ACK) and our IS issues ACK back.
    • Now immediately there will be a HTTP request A before IS socket pool sweeper is executed to close the connection 12345. So, IS will post this HTTP request A to target with existing TCP connection 12345 (as its not yet closed by sweeper) and waits for the response from target.
    • As per wireshark TCP dump, there is a [RST, ACK] from target system to IS and new connection say 67890 is created from IS to target system to post same HTTP request A again. (Duplicate request?)

    Question is :

    1. Which system is initiating this new connection to post the http request again? is it pub.client.http or the TCP protocol?
    2. Is this a expected behavior to resend HTTP request A on TCP [RST,ACK] packet from target system which has already been sent? Can we configure this in IS?

    Thanks in advance for your reply.

    Note: To know on what is socket pool sweeper keepAliveTimeout in pub.client:http - #17 by Niranth_NS

    Regards,
    Niranth


    #Flow-and-Java-services
    #Integration-Server-and-ESB
    #webMethods
    #Service-Designer


  • 2.  RE: TCP connection in IS pub.client:http - Resending HTTP request on TCP [RST,ACK] packet, which has already been sent to Target

    Posted Mon August 29, 2022 11:24 AM

    Hi @Niranth_NS ,

    Can you please share socketpool log file by enabling watt.net.socketpool.debug=true while reproducing this behavior?
    What are the values set in pub.client.http? please share.
    What is the value of watt.net.maxRetries configured ?

    Regards,
    Nilima


    #Service-Designer
    #Integration-Server-and-ESB
    #Flow-and-Java-services
    #webMethods


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