TCP/IP Error 733 in Windows XP

Posted on 2004-11-10
Last Modified: 2008-03-17
I have set up a windows xp computer with a VPN connection to a Windows 2003 Server.  I get to the point where the computer is being registered on the network and then I get an error:
TCP/IP CP Reported Error 733: The connection could not be completed because your computer and the remote computer could not negotiate PPP control protocols.  

I have unchecked the Negotiate multilink box but still no luck.  Any ideas?

FYI: The VPN worked last week on my old xp laptop.  

Please feel free to e-mail at wth any help.  Thanks!!!
Question by:hdesai3
    LVL 5

    Expert Comment

    Have you compared the vpn settings on your laptop to the new one?

    I normally (using default windows vpn connections) change the security of the VPN to the following.

    On security, I select Advanced, then settings and change it to optional security.  I only do this on problem connections.

    If that works, you can try and tighten it up again, by matching the requirements of the VPN server on the Client.

    This error is generated when there is an incompatibility between server and client in negotiating a secure connection.

    Start by checking the properties of the vpn connection on the laptop and compare.

    Author Comment

    Thank you so much.  The VPN connection works now but I have another problem.  I cannot map any of the network drives when I am connected through VPN.  Any ideas?
    LVL 5

    Expert Comment

    As stupid as this my sound have you checked if the windows xp firewall is activated on the network card. I have had problems accessing network drives if the firewall is enabaled.
    LVL 5

    Accepted Solution

    You need to have certain ports enabled.  There was a similar issue the other day, and the guy found out that ports 135-138 were being blocked.  You can either disable the windows firewall but it has an exception listed for file and printer sharing.

    However you may have a firewall in your router, in which case ports 136-138 and 53 for DNS need to be open via VPN.  

    LVL 5

    Expert Comment

    Opening up Port 443 (HTTPS) might also be a go idea depending on your network infastructure.

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