How to connect Windows XP to PPTP server?

Hello everybody,
I hava a problem with configuring PPTP server on my MT RouterOS.
I have done everything from documentation to configure my PPTP server but I can’t established connection. http://www.mikrotik.com/testdocs/ros/2.9/interface/pptp.php?notfound=6&

When i try to connect the connection stops on the message in the attachment!
error.JPG
Help me please!!!
Thanks in advanced

You’ll have to post your config so we can see what’s what.

yes, post all config that you made for the RouterOS PPTP server, and also your XP client config.