Activating a KD Connection Server
The KD connection server that is included in Debugging Tools for Windows is called KdSrv (kdsrv.exe). To activate a KD connection server, open an elevated Command Prompt window (Run as Adminstrator), and enter the kdsrv command.
Note You can activate a KD connection server without having elevated privileges, and debugging clients will be able to connect to the server. However, clients will not be able to discover a KD connection server unless it was activated with elevated privileges. For information about how to discover debugging servers, see Searching for KD Connection Servers.
KdSrv supports several transport protocols: named pipe (NPIPE), TCP, COM port, secure pipe (SPIPE), and secure sockets layer (SSL).
The syntax for the KdSrv command line depends on the protocol used. The following options exist:
kdsrv -t npipe:pipe=PipeName[,hidden][,password=Password][,IcfEnable]
kdsrv -t tcp:port=Socket[,hidden][,password=Password][,ipversion=6][,IcfEnable]
kdsrv -t tcp:port=Socket,clicon=Client[,password=Password][,ipversion=6]
kdsrv -t com:port=COMPort,baud=BaudRate,channel=COMChannel[,hidden][,password=Password]
kdsrv -t spipe:proto=Protocol,{certuser=Cert|machuser=Cert},pipe=PipeName[,hidden][,password=Password]
kdsrv -t ssl:proto=Protocol,{certuser=Cert|machuser=Cert},port=Socket[,hidden][,password=Password]
kdsrv -t ssl:proto=Protocol,{certuser=Cert|machuser=Cert},port=Socket,clicon=Client[,password=Password]
The parameters in the previous commands have the following possible values:
pipe= PipeName
When NPIPE or SPIPE protocol is used, PipeName is a string that will serve as the name of the pipe. Each pipe name should identify a unique process server. If you attempt to reuse a pipe name, you will receive an error message. PipeName must not contain spaces or quotation marks. PipeName can include a numerical printf-style format code, such as %x or %d. This will be replaced by the process ID of KdSrv. A second such code will be replaced by the thread ID of KdSrv.
port= Socket
When TCP or SSL protocol is used, Socket is the socket port number.
It is also possible to specify a range of ports separated by a colon. KdSrv will check each port in this range to see if it is free. If it finds a free port and no error occurs, the KD connection server will be created. The smart client will have to specify the actual port being used to connect to the server. To determine the actual port, use any of the methods described in Searching for KD Connection Servers; when this KD connection server is displayed, the port will be followed by two numbers separated by a colon. The first number will be the actual port used; the second can be ignored. For example, if the port was specified as port=51:60, and port 53 was actually used, the search results will show "port=53:60". (If you are using the clicon parameter to establish a reverse connection, the smart client can specify a range of ports in this manner, while the KD connection server must specify the actual port used.)
clicon= Client
When TCP or SSL protocol is used and the clicon parameter is specified, a reverse connection will be opened. This means that the KD connection server will try to connect to the smart client, instead of letting the client initiate the contact. This can be useful if you have a firewall that is preventing a connection in the usual direction. Client specifies the network name or IP address of the computer on which the smart client exists or will be created. The two initial backslashes (\) are optional.
Since the KD connection server is looking for one specific client, you cannot connect multiple clients to the server if you use this method. If the connection is refused or is broken you will have to restart the process server. A reverse-connection KD connection server will not appear when someone uses the -QR command-line option to display all active servers.
Note When clicon is used, it is best to start the smart client before the KD connection server is created, although the usual order (server before client) is also permitted.
port= COMPort
When COM protocol is used, COMPort specifies the COM port to be used. The prefix "COM" is optional -- for example, both "com2" and "2" are acceptable.
baud= BaudRate
When COM protocol is used, BaudRate specifies the baud rate at which the connection will run. Any baud rate that is supported by the hardware is permitted.
channel= COMChannel
If COM protocol is used, COMChannel specifies the COM channel to be used in communicating with the debugging client. This can be any value between 0 and 254, inclusive. You can use a single COM port for multiple connections using different channel numbers. (This is different from the use of a COM ports for a debug cable -- in that situation you cannot use channels within a COM port.)
proto= Protocol
If SSL or SPIPE protocol is used, Protocol specifies the Secure Channel (S-Channel) protocol. This can be any one of the strings tls1, pct1, ssl2, or ssl3.
Cert
If SSL or SPIPE protocol is used, Cert specifies the certificate. This can either be the certificate name or the certificate's thumbprint (the string of hexadecimal digits given by the certificate's snapin). If the syntax certuser=Cert is used, the debugger will look up the certificate in the system store (the default store). If the syntax machuser=Cert is used, the debugger will look up the certificate in the machine store. The specified certificate must support server authentication.
hidden
Prevents the KD connection server from appearing when someone uses the -QR command-line option to display all active servers.
password= Password
Requires a smart client to supply the specified password in order to connect to the KD connection server. Password can be any alphanumeric string, up to twelve characters in length.
Warning Using a password with TCP, NPIPE, or COM protocol only offers a small amount of protection, because the password is not encrypted. When a password is used with SSL or SPIPE protocol, it is encrypted. If you want to establish a secure remote session, you must use SSL or SPIPE protocol.
ipversion=6
(Debugging Tools for Windows 6.6.07 and earlier only) Forces the debugger to use IP version 6 rather than version 4 when using TCP to connect to the Internet. In Windows Vista and later versions, the debugger attempts to auto-default to IP version 6, making this option unnecessary.
IcfEnable
Causes the debugger to enable the necessary port connections for TCP or named pipe communication when the Internet Connection Firewall is active. By default, the Internet Connection Firewall disables the ports used by these protocols. When IcfEnable is used with a TCP connection, the debugger causes Windows to open the port specified by the Socket parameter. When IcfEnable is used with a named pipe connection, the debugger causes Windows to open the ports used for named pipes (ports 139 and 445). The debugger does not close these ports after the connection terminates.
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