VPN setup and failure to authenicate link with server

Here in France. Using a Mac laptop to link to my server back in the UK.
Have downloaded remote desktop ready but can't set up the link.

To start I followed some instructions i had been given..which said..

[Enter the server address for your PPTP server (XXXX.dyndns.org) and
the appropriate credentials (XX/XX****); you should be able to get
these from your server's administrator. Once you have everything filled
out, click the Connect button. Watch the Status field to be sure you
are establishing a connection. After the connection is up, you can
check in the Network pane of System Preferences for a PPTP device. This
device will show you your VPN connection's network address information,
much like any other network adapter.]

Heres to connection log..as i'm cautious have deleted the dns address
below.

Connection Log:
Fri Oct 21 14:55:21 2005 : PPTP connecting to server
'XXXXXX.dyndns.org' ( )...
Fri Oct 21 14:55:21 2005 : PPTP connection established.
Fri Oct 21 14:55:21 2005 : Using interface ppp0
Fri Oct 21 14:55:21 2005 : Connect: ppp0 <--> socket[34:17]
Fri Oct 21 14:55:24 2005 : MS-CHAP authentication failed: Good luck!
Fri Oct 21 14:55:24 2005 : Connection terminated.
Fri Oct 21 14:55:24 2005 : PPTP disconnecting...
Fri Oct 21 14:55:24 2005 : PPTP disconnected
Fri Oct 21 14:55:40 2005 : PPTP connecting to server
' XXXXXX.dyndns.org' ()...
Fri Oct 21 14:55:40 2005 : PPTP connection established.
Fri Oct 21 14:55:40 2005 : Using interface ppp0
Fri Oct 21 14:55:40 2005 : Connect: ppp0 <--> socket[34:17]
Fri Oct 21 14:55:43 2005 : MS-CHAP authentication failed: Good luck!
Fri Oct 21 14:55:43 2005 : Connection terminated.
Fri Oct 21 14:55:43 2005 : PPTP disconnecting...
Fri Oct 21 14:55:43 2005 : PPTP disconnected
Fri Oct 21 14:55:43 2005 : PPTP disconnected


Help?

Is there something I am missing?
Thanks
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