Pls help with "zombie" TCP socket

["Alex V. Toropov" <alex@ct.spb.ru>]

Hi All,

I've a problem with some TCP-listening application (hylafax on 4559/tcp)
which die with "Oops" and left opened TCP socket with client
which is not running now also.

This connection is shown by netstat as "established" with Send-Q = 25 
fuser say that 4559/tcp has no process references.

How can I clear (wipe) this connection to free the said port ?

TIA Alex