Error 734: The PPP link control protocol was terminated.
Error 629: The port was disconnected by the remote machine.
Error 640: A NetBIOS error has occurred.
This behavior can occur if any of the following conditions are true:
(i) The settings for your broadband dial-up connection to your ISP are configured incorrectly. The broadband dial-up connection's security option is incorrectly configured to use the Require secured password setting To verify this click on Start > Run > and then type ncpa.cpl and click OK. In the resulting window, Right Click on the icon with Wan MiniPort (PPPoE) and select properties and then click on Security. Check up in the text box marked as Validate My Identity as follows should be set to Allow Unsecured Password. If not, please select the said option and click OK to close the windown and try to login now.
(ii) The simplest way is to recreate the connection after removing the old one.. Error No. 629 and 640 are normally seen on Windows 98 machines.
(iii) If the error persists, try to delete and add the Net BIOS protocol again.