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https://issues.apache.org/jira/browse/FTPSERVER-424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15881171#comment-15881171
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Mark Riordan commented on FTPSERVER-424:
----------------------------------------
We can reliably reproduce this passive port exhaustion problem in about 45
minutes, using JMeter with an FTPS sampler. The problem reproduces in both
1.1.0 and 1.0.6.
> Leak of allowed passive ports
> -----------------------------
>
> Key: FTPSERVER-424
> URL: https://issues.apache.org/jira/browse/FTPSERVER-424
> Project: FtpServer
> Issue Type: Bug
> Affects Versions: 1.0.6
> Reporter: Taras Puchko
>
> In several hours after start the server cannot accept passive connections if
> allowed passive ports are configured.
> This is caused by FTPSERVER-420,
> org.apache.ftpserver.impl.PassivePorts.reserveNextPort() lines 218-219,
> where the value removed from the freeList might be different from the value
> added to the usedList, if checkPortUnbound returns false before.
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