XP system connection VPN hint error 633: The modem is already in use the solution graphic tutorial

Workaround:

1, at the same time press the WIN+R key combination (Win is alt next to the Microsoft icon key), in the running window input regedit.exe, click OK;

2, in the registry to the left of the point open: hkey_local_machine\system\currentcontrolset\services\tcpip\parameters;

3, select Parameters, click on the Menu "edit", a new "multiple string value" item, and then named ReservedPorts;

4, double click Create "ReservedPorts", enter 1723-1723 in "Numerical data", click OK, then close Registry Editor;

5, press Win+r key combination, enter Cmd.exe in the run, enter Netstat-aon and return in the Command Prompt window, find out the program that occupies TCP 1723 port, and then use taskkill/pid pid/f command to force the end of the process;

6, enter the Exit command return, exit the command prompt, restart the computer. If there is no accident, you can connect to the VPN.

The above is the XP system connection VPN hint error 633: The modem is using the solution to the graphics and text tutorial, the method is very simple, encounter similar problems of users, may wish to follow the above method to solve look.