1 . how can i disable a multi-logging facility in linux Redhat 6.2. I means only one sessions per user can be establish at one time.

2. I have enable a Masquerading connection on my Linux Redhat 6.2 box . when i issue a command to check the masquerading connections it show my the following entries.

IP masqerading entries.
proc exprire source destination ports

TCP 00:45.77 192.168.0.10 redhat.com 1173 (61224) -->ftp
TCP 01:42.65 192.168.0.140 baym-cs59.msgr.hotmail.com 1074 (61193) -->1863
TCP 01:42.65 192.168.0.103 baym-cs153.msgr.hotmail.com 1084 (61293) -->1863
TCP 02:15.23 192.168.0.23 202.152.150.240 1381 (62821) -->http
TCP 02:42.43 192.168.0.12 yahoo.com 1242 (61217) -->pop3

Can any one tell me, how can I kill a particular socket connection i.e how to kill a Ftp connection plus in the ports section what (61224) this represents its an process number or something else.