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https://issues.apache.org/jira/browse/FTPSERVER-302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gusti Benawi updated FTPSERVER-302:
-----------------------------------

    Summary: Passive free port returned is not checked if it is really free or 
not  (was: Passive free port is not checked)

> Passive free port returned is not checked if it is really free or not
> ---------------------------------------------------------------------
>
>                 Key: FTPSERVER-302
>                 URL: https://issues.apache.org/jira/browse/FTPSERVER-302
>             Project: FtpServer
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.0.0
>            Reporter: Gusti Benawi
>
> A passive port is requested by calling the method 
> DataConnectionConfiguration.requestPassivePort()
> The search of a free port is done by PassivePorts.reserveNextPort()
> The "free" port returned is based on an internal boolean flag, which 
> determines whether a port is free or not. 
> This is bad since the port returned could be actually being used by another 
> application. The port will still be returned, and an exception will be thrown 
> since it will fail to create the data socket.

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