If you enter a name for the Master service/port in the Tunnelling tab of the Properties window, that name must be listed in the Windows services file.
Since each manufacturer's services file is different, you must find the services file that your TCP/IP protocol stack is currently using. A Microsoft TCP/IP implementation typically puts the services file in the C:\Windows (or equivalent) directory. Most third party software either installs the services file in the same directory that their software was installed or into a directory named C:\ETC. Refer to your TCP/IP documentation for the location of this file.
In Windows NT, the installation program attempts to edit a services file in the \winnt\system32\drivers\etc directory.
In Windows XP, the installation program currently does not attempt to edit the services file. The default directory for that file is C:\WINDOWS\system32\drivers\etc\.
Once you have found the services file, you must add the line:
using a text editor. For example, to assign the name datahub to port 4600, you would add the line:
Remember that if you edit the services file with Notepad, it will attach a .txt suffix when it saves the file so that you will not in fact have edited the system services file, but instead created a new file, named services.txt. You should rename that file services, without the .txt extension.
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