linux-kernel - Re: Address already in use problem

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Message-ID: <20160921154304.GB13620@hmsreliant.think-freely.org>
Date:   Wed, 21 Sep 2016 11:43:04 -0400
From:   Neil Horman <nhorman@...driver.com>
To:     Sun Paul <paulrbk@...il.com>
Cc:     linux-sctp@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Address already in use problem

On Wed, Sep 21, 2016 at 09:44:30PM +0800, Sun Paul wrote:
> Hi
> 
> we have an SCTP application running in JAVA. and we found that there
> is a problem when we as a client trying to connect to a remote IP
> address.
> 
> If the remote IP address is not accessible, our application will keep
> retrying to connect using a self-defined local port address, says
> 51001,
> 
> We found that after sometimes, says 2 hrs, this port 51001 is never
> able to bind to us again. even we tried to restart the application.
> 
Sounds like you have another application that inadvertently bound to that port.
Its not a privlidged port, nor is it well known, so it seems plausible that
another application would eventually bind to it.  Thats not a bug, just the way
ip works.

run netstat -anp | grep 51001

And see what application is holding the port.

Neil

> Is there anyone know how we can resolve this?
> 
> -RBK
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