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https://issues.apache.org/jira/browse/FTPSERVER-250?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Niklas Gustavsson resolved FTPSERVER-250.
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Resolution: Fixed
Fix Version/s: 1.0.0-RC1
Assignee: Niklas Gustavsson
I've enabled reuse of local addresses for active data connection sockets in rev
729486. I also added in your tests and BindExceptionParallelTest now runs fine
with 200 clients. Could you please verify that this fixes the issue on your
machine as well.
> java.net.BindException: Address already in use
> ----------------------------------------------
>
> Key: FTPSERVER-250
> URL: https://issues.apache.org/jira/browse/FTPSERVER-250
> Project: FtpServer
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.0-RC1
> Environment: linux, windows
> Reporter: Jiri Kuhn
> Assignee: Niklas Gustavsson
> Fix For: 1.0.0-RC1
>
> Attachments: BindExceptionParallelTest.java,
> BindExceptionSerialTest.java, ClientTestTemplate.patch
>
>
> I have configured ftp server to use particular interface and port on active
> data mode like
> <active enabled="true" local-address="127.0.0.1" local-port="2020"
> ip-check="true"/>
> After that, the server starts to throw java.net.BindException: Address
> already in use during second and other data transfer. First data transfer is
> always ok. It seems that it has something to do with TIME_WAIT tcp port state
> (as it can be seen using netstat utility).
> I have created two tests, one for serial execution and one for parallel
> execution, see attached files (patch for ClientTestTemplate required)
> - serial execution - emulates what I'm doing in command line ftp client (or
> any other client), I'm always able to reproduce it on linux, but never on
> windows xp sp2
> - parallel execution - emulates situation when more then one data connection
> has to be opened in one time, it fails with two clients on linux (but it may
> by simple serial execution failure), on windows it fails with three clients
> BUT - I have tested the parallel test against proftpd server (fixed data port
> 20) with 30 clients and none of them fails.
> Are you able to reproduce the behaviour I have observed?
> Does anyone with deeper knowledge of java socket programming know if it is
> possible to bind a port once and then reuse it for generally unlimited number
> of (simultaneous) connections?
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