Passive free port is not checked
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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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