PowerConnect 5324 close telnet session

Hello,

First of all, excuse me for my english.

I have a problem with my PowerConnect 5324.

I have too many opened telnet session and I can not open a new telnet connection.

I can connect with the console port and serial cable.

I can see the telnet session with this command line :

SW-1-C#show user

   Username       Protocol          Location
--------------- ------------ -----------------------
                   Serial            0.0.0.0
administrateur      HTTP          172.16.0.246
administrateur      HTTP          172.16.0.246
administrateur     Telnet         172.16.0.246
administrateur     Telnet         172.16.0.246
administrateur     Telnet         172.16.0.246
administrateur     Telnet         172.16.0.246

SW-1-C#show session

Connection   Host                            Address             Port    Byte

-----------  ----------------------------    ------------------- ------  ------

 

What is the command line for logout the telnet session?

Thanks for your help!