Excerpts from netbsd: 12-Dec-97 Lasting connections Stephen
Ma@jtec.com.au (5120*)

> Matthias> about haf a dozen TCP connections which are in state
> Matthias> "CLOSING" for a long time, one of them even for weeks. There
> [...]
> This is a probably because of a "known problem" in the BSD stack.
> Richard Stevens posted a suggested fix for this problem, which I've
> reproduced below.

see PR kern/2335

best regards
Matthias