Hi,
on linux we noticed that a number of file descriptors associated with sockets are leaked when using FTP/S TLS/Explicit as we serve connect and disconnects (and -- possibly - LIST commands returning empty lists) eventually leading to a "Too Many Files Opened" condition as we hit th 1024 file descriptor limit in /proc. For each connect/disconnect/list cycle we observe a leak of about 10 socket file descriptors. JMAP does not show any unreachable java references, so the problem may originate deeper, closer to native JVM layers or as a consequence of some java.nio verb misuse (btw we validated this both on J2SE 5 and J2SE 6). We detect this by issuing "jmap -histo:live <procid> | grep -i socket" (the ":live" directive selects only live references that would not be garbage collected). We are "locked" on revision version 681183 of FTP Server and cannot easily upgrade right now, moreover we plugged a few custom components (a user manager, a virtual file system manager and a jce provider) which may or may not be part of the problem. Has anyone seen this before? Can you provide some troubleshooting hints for this kind of problem? Any help is highly appreciated. Cheers, F.
