FTPClient hangs occassionally.

Plugin properties:
Implementation-Title: ftppublisher
Implementation-Version: 1.2
Short-Name: ftppublisher
Long-Name: FTP publisher plugin
Url: http://wiki.hudson-ci.org/display/HUDSON/FTP-Publisher+Plugin
Compatible-Since-Version: 1.0
Plugin-Version: 1.2

Stacktrace of a susspended thread:
Executor #0 for JenkinsSlave14 : executing Ramos.Dev.jRamos.Unit #9892
java.net.PlainSocketImpl.socketAccept(Native Method)
java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398)
java.net.ServerSocket.implAccept(ServerSocket.java:530)
java.net.ServerSocket.accept(ServerSocket.java:498)
org.apache.commons.net.ftp.FTPClient.openDataConnection(FTPClient.java:502)
org.apache.commons.net.ftp.FTPClient.__storeFile(FTPClient.java:388)
org.apache.commons.net.ftp.FTPClient.storeFile(FTPClient.java:1388)
com.zanox.hudson.plugins.FTPSite.upload(FTPSite.java:358)
com.zanox.hudson.plugins.EntryCopier.copyFile(EntryCopier.java:87)
com.zanox.hudson.plugins.EntryCopier.copy(EntryCopier.java:77)
com.zanox.hudson.plugins.FTPPublisher.perform(FTPPublisher.java:179)
hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:45)
hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:726)
hudson.model.Build$BuildExecution.post2(Build.java:185)
hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:671)
hudson.model.Run.execute(Run.java:1766)
hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
hudson.model.ResourceController.execute(ResourceController.java:98)
hudson.model.Executor.run(Executor.java:381)

The plugin uses jenkins/plugins/ftppublisher/WEB-INF/lib/commons-net-1.4.1.jar.
Seems a similar problem described in https://issues.apache.org/jira/browse/NET-152.

Could you update commons-net lib?