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From "Jonathan Valliere (Jira)" <j...@apache.org>
Subject [jira] [Commented] (DIRMINA-1135) Connections hanging around in CLOSE_WAIT state, not getting cleaned up properly
Date Mon, 12 Oct 2020 03:04:00 GMT

    [ https://issues.apache.org/jira/browse/DIRMINA-1135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17212100#comment-17212100
] 

Jonathan Valliere commented on DIRMINA-1135:
--------------------------------------------

Have you been able to pinpoint whether the issue is related to MINA or your code? 

> Connections hanging around in CLOSE_WAIT state, not getting cleaned up properly
> -------------------------------------------------------------------------------
>
>                 Key: DIRMINA-1135
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-1135
>             Project: MINA
>          Issue Type: Bug
>            Reporter: kjhawierhjbasdf
>            Assignee: Jonathan Valliere
>            Priority: Major
>         Attachments: Screenshot 2020-10-05 at 8.31.37 AM.png, Screenshot 2020-10-05 at
9.10.31 AM.png
>
>
> Hello Team,
> We are using Apache MINA(v2.0.21) for tcp tls server implementation.
> I tried with running following operations in loop,
> establishing 200-300 connections 
> sending data
> closing connections
> And I observed that, closed connections were getting cleaned up properly.
> In another scenario, We tried configuring AWS ALB and target group, which was establishing
connection for healthcheck. These were not valid tls connections, but only tcp connections.
And In this case, we observed that, connections were in CLOSE_WAIT state, And these CLOSE_WAITs
are hanging around far too long. This was impacting our service.
> I did debug the TCP server code, I found that when the sessionClosed method is never
getting called. Then I tried closing session from sessionIdle method, Even after that session.isConnected
is showing true, connection is not getting closed.
>  
> Our product owner is raising concern about, we should be able to avoid denial of service
attack.
>  
> Can you please provide pointers to investigate further.
> Thanks,
> Rupesh Shah



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