David Brooker created FTPSERVER-481:
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Summary: Artificially running out of passive ports under load
Key: FTPSERVER-481
URL: https://issues.apache.org/jira/browse/FTPSERVER-481
Project: FtpServer
Issue Type: Bug
Components: Core
Affects Versions: 1.1.0
Environment: Windows 2008R2 virtual machine with 4GB RAM, 4 CPU cores.
Oracle Java 1.8.0_121. FTP server configured for 200 users and passive mode
ports specified between 3000-3600.
Reporter: David Brooker
Attachments: ftpd-full.xml, ftpd_pp_leak_snip.txt, heap.zip
When loading the FTP server with 200 users that are downloading files via FTPS
in passive mode (implicit), the server eventually appears to run out of passive
ports. FTPD log shows numerous instances of "cannot find an available passive
port" (see txt attachment). While embedded, it appears the ftpd server also has
a memory leak (separate heap dump available upon request - file is too large to
attach)
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