How to achieve port shutdown on dell 5424 switch ?

Hi,

I am trying to shutdown particular port on dell  powerconnect 5424 switch using config mode , but it doesn't seem to work  . Is there any way we can achieve this ?

swpnst40ggsn14-1# show interfaces status ethernet g9
                                             Flow Link          Back   Mdix
Port     Type         Duplex  Speed Neg      ctrl State       Pressure Mode
-------- ------------ ------  ----- -------- ---- ----------- -------- -------
g9       1G-Copper    Full    1000  Enabled  Off  Up          Disabled On

swpnst40ggsn14-1#
swpnst40ggsn14-1#
swpnst40ggsn14-1#
swpnst40ggsn14-1# configure
swpnst40ggsn14-1(config)# interface ethernet
swpnst40ggsn14-1(config)# interface ethernet g9
swpnst40ggsn14-1(config-if)# shutdown
swpnst40ggsn14-1(config-if)# end

swpnst40ggsn14-1# show interfaces status ethernet g9
                                             Flow Link          Back   Mdix
Port     Type         Duplex  Speed Neg      ctrl State       Pressure Mode
-------- ------------ ------  ----- -------- ---- ----------- -------- -------
g9       1G-Copper    Full    1000  Enabled  Off  Up          Disabled On

swpnst40ggsn14-1# show system
System Description:                       PowerConnect 5424
System Up Time (days,hour:min:sec):       28,06:23:30
System Contact:
System Name:                              swpnst40ggsn14-1
System Location:
System MAC Address:                       00:23:ae:bc:7a:b0
System Object ID:                         1.3.6.1.4.1.674.10895.3020
Type:                                     Ethernet Switch

Main Power Supply Status:                 OK
Fan 1 Status:                             OK
Fan 2 Status:                             OK

          Unit            Temperature (Celsius)            Status
------------------------ ------------------------ ------------------------
           1                        33                       OK