Too many connections in "CLOSING" state

Hello,

I have a huge number of TCP connections in "CLOSING" state (it grow
for +/- 30 per minutes). it seems to be a bug in mldonkey-2.4-4...
Yes, I know I'm not talking to the "mldonkey support"...

Even if I kill the process, the connections stays for a really long
while in the kernel table... Is there a tunable timer to put these
connections out of my stack ? (something like the TIME_WAIT timer) ?
Whith +/- 5000 connections in this state, my system is radicaly
impacted... and it take some hours (or a reboot) to restore the
normal working of the system...

Thx

Robert