After the server is stopped, the tcp port 1864 is still listening (a bug in the server), is there an unix command to close the socket.

# netstat -na
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 172.20.11.242:1864 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 172.20.11.242:22 172.20.11.211:32877 ESTABLISHED
tcp 0 0 172.20.11.242:22 172.20.10.119:32789 ESTABLISHED
tcp 0 0 172.20.11.242:22 172.20.11.211:32878 ESTABLISHED
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 902 /var/run/acpid.socket
unix 10 [ ] DGRAM 741 /dev/log
unix 2 [ ] DGRAM 8305323
unix 2 [ ] DGRAM 1500912
unix 2 [ ] DGRAM 705953
unix 2 [ ] DGRAM 11894
unix 2 [ ] DGRAM 1172
unix 2 [ ] DGRAM 999
unix 2 [ ] DGRAM 946
unix 2 [ ] DGRAM 753
unix 2 [ ] STREAM CONNECTED 433

if the server is really stopped, how can the port still be listening? Correct me if I'm wrong, but I didn't think a program could still be bound to a port after it is killed.