[jboss-jira] [JBoss JIRA] Updated: (JBAS-4558) Connection Timeout Immediately After ACKing A Request

[Mike Millson (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBAS-4558?page=all ]

Mike Millson updated JBAS-4558:
-------------------------------

    Attachment: drop5.cap

Packet capture that shows the issue.

> Connection Timeout Immediately After ACKing A Request
> -----------------------------------------------------
>
>                 Key: JBAS-4558
>                 URL: http://jira.jboss.com/jira/browse/JBAS-4558
>             Project: JBoss Application Server
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Web Services
>    Affects Versions: JBossAS-4.0.2 Final
>            Reporter: Mike Millson
>         Assigned To: Thomas Diesler
>         Attachments: drop5.cap
>
>
> The customer has an application that periodically sends Web service requests to JBoss AS every 20 secs in sets of 4, to check wether the Web Service is up. They find that JBoss AS occasionally drops the request packets when the HTTP connector timeout is set to 20 seconds. When this happens, the packet sequence is very strange. Attached is an example packet sequence viewable using ethereal/WireShark.
> #275: Client sends request >20 seconds after #274 acknowledgment
> #276: Server sends ACK for #275
> #277: Server sends connection timeout FIN/ACK
> #278 Client sends combined ACK for #277 and FIN/ACK
> #279 Server sends ACK for #278
> Packet #275 was more than 20 seconds after the last packet was sent; however, it was received before the server initiated the connection timeout sequence in packets #277-279. It seems to be unaware of the ACK in #276. Almost as if the timeout sequence started, then before the FIN/ACK could be sent, another packet was received and acknowledged. Some sort of timing issue when a request is sent at the same time a connection times out. 

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