This trick I learned from my one of ex-college.  In Windows servers, only two remote desktop sessions allowed with administrative access. There are situations, you can’t connect to the server via remote desktop because of two sessions already active.  You may have seen this dialog box. ("Remote Desktop Disconnected", "This computer can’t connect to the remote computer")

Usually Windows Administrators, open "Terminal Services Manager" (in Administrative tools), connect to the problematic server and log off the unwanted sessions.  There are easy ways if you love command line based tools.

Query the Remote Server for Current Terminal Sessions

To query and list the sessions on the remote session, you could use QUser.exe or QWinsta

1. QUser

QUser command comes with all the latest Windows clients and servers. This will list the sessions of the remote server (or local machine).

NOTE: if you are using Windows XP, you need to add this location into your System path: C:WindowsSystem32DLLCache. To do this, in command prompt, type the following.

SET PATH = %PATH%;C:WindowsSystem32DLLCache;

QUser help shows,

C:Anand>QUser /?
Display information about users logged on to the system.

QUERY USER [username | sessionname | sessionid] [/SERVER:servername]

  username            Identifies the username.
  sessionname         Identifies the session named sessionname.
  sessionid           Identifies the session with ID sessionid.
  /SERVER:servername  The server to be queried (default is current).

 

E.g.,

C:>quser /server:MyCitrixSVR
USERNAME              SESSIONNAME        ID  STATE   IDLE TIME  LOGON TIME
johndoe               ica-tcp#966        10  Active          7  7/31/2008 3:04 PM
averagejoe            ica-tcp#969         1  Active          9  7/31/2008 3:30 PM
familyman             ica-tcp#984         5  Active       1:06  7/31/2008 4:33 PM
normaldude            ica-tcp#987         2  Active          4  7/31/2008 6:20 PM
 

2. QWinsta

QWinsta is little different and better. It has more features and options. It comes with all flavors of Windows.  QWinsta command line help displays as,

C:>qwinsta /?
Display information about Terminal Sessions.

QUERY SESSION [sessionname | username | sessionid]
              [/SERVER:servername] [/MODE] [/FLOW] [/CONNECT] [/COUNTER]

  sessionname         Identifies the session named sessionname.
  username            Identifies the session with user username.
  sessionid           Identifies the session with ID sessionid.
  /SERVER:servername  The server to be queried (default is current).
  /MODE               Display current line settings.
  /FLOW               Display current flow control settings.
  /CONNECT            Display current connect settings.
  /COUNTER            Display current Terminal Services counters information.

E.g.,

C:>qwinsta /server:citrixserver
SESSIONNAME       USERNAME                 ID  STATE   TYPE        DEVICE
                                             0  Disc    rdpwd
ica-tcp                                 65536  Listen  wdica
rdp-tcp                                 65537  Listen  rdpwd
console                                    16  Conn    wdcon
ica-tcp#966       johndoe                  10  Active  wdica
ica-tcp#969       apple                     1  Active  wdica
ica-tcp#984       averagejoe                5  Active  wdica
ica-tcp#987       familyman                 2  Active  wdica
ica-tcp#989       whoisme                   3  Active  wdica

You are welcome to try the other options QWinsta provides.

Logoff the Remote Sessions

To Log off the terminal session of the remote server, you can use any one of two command line tools. One of LOGOFF and another one is RWINSTA. Before you log off the remote session, you should know the "Session ID" which you get it from "QUSER" OR "QWINSTA" commands as above stated.

1. Logoff

Logoff command kicks off (logging off) the specified remote session. Log off help shows,

C:>logoff /?
Terminates a session.

LOGOFF [sessionname | sessionid] [/SERVER:servername] [/V]

  sessionname         The name of the session.
  sessionid           The ID of the session.
  /SERVER:servername  Specifies the Terminal server containing the user
                      session to log off (default is current).
  /V                  Displays information about the actions performed.

 

E.g.,

C:>logoff /server:infra-apps 1 /v
Logging off session ID 1

2. RWinsta

RWinsta has same parameters and does same thing as log off command. It simply means Reset WINdows STAtion. The help goes as,

C:>RWinsta /?
Reset the session subsytem hardware and software to known initial values.

RESET SESSION {sessionname | sessionid} [/SERVER:servername] [/V]

  sessionname         Identifies the session with name sessionname.
  sessionid           Identifies the session with ID sessionid.
  /SERVER:servername  The server containing the session (default is current).
  /V                  Display additional information.

E.g.,

C:>RWinsta /Server:MyWinServer 1

Note: RWinsta command does not return anything.

Happy Re-setting the remote sessions (Hey, stop cursing your co-workers who didn’t log off their sessions).

logoff remote desktop sessions via command line tools