1) if you have firewall, open TCP Port 1723, IP Protocol 47 (GRE).
2) make sure you can reach the VPN server by using ping. Sometimes, poor connection can cause this issue too.
3) You may need to updated firmware on a router or firewall if other OS (win9x/nt/me/w2k) works except XP.
4) The VPN server may not be able to get IP from DHCP for the VPN client. So, you may want to re-configure VPN host networking settings. For XP pro VPN host, go to the Properties of the VPN>Network, check Specify TCP/IP address and Allow calling computer to specify its own IP address, and uncheck Assign TCP/IP addresses automatically using DHCP.
5) Make sure no other secure software blocks your access, for example, if you use Norton secure software, you may need to add the remote client's IP so that the client can access.
6) If your VPN running on a Windows RRAS with NAT enabled, you may want to check the NAT settings.
7) If you can establish the VPN from the desktop at home but not from the laptop. Make sure no security software like Microsoft OneCare software that blocks the GRE.
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Found this link, seems to relate to the IP configuration when setting up PPTP connections. I haven't set up one of those since XP so I'm honestly not the best to answer how to... read through the link and see if its helps you.
If you try to establish a Point-to-Point Protocol (PPP)
dial-up connection, you may receive the following error message:
Error 734: The PPP link control protocol was terminated.
As a result, you cannot establish a dial-up connection.
This issue may occur if either of the following conditions
Multi-link negotiation is turned on for the single-link
The dial-up connection security configuration is
incorrectly configured to use the Require secured password
To resolve this issue:
Click Start, point to Settings, and then click Network and Dial-up
NOTE: For Windows Server 2003, click Start, point to
Control Panel, and then point to Network
Right-click the appropriate dial-up networking connection,
and then click Properties.
Click the Networking tab, and then click Settings.
Click to clear the Negotiate multi-link for single
link connections check box (if it is selected).
Click OK, and then click OK.
Double-click the connection, and then click Dial.
If this procedure resolves the issue and you can
establish a dial-up connection, you do not have to follow the remaining steps
in this article.
If this does not resolve the issue and you cannot
establish a dial-up connection, go to step 7 to continue to troubleshoot this
Right-click the connection, and then click Properties.
Click the Security tab.
Under Security options, click
Allow unsecured password in the Validate my identity
as follows box, and then click OK.
Double-click the connection, and then click Dial to verify that you can establish a dial-up connection.
if you are getting 169.x.x.x then your connection is not established and your netwirk key is wrong . you have to contact your isp yo establish the connection or if you have right network key you can try that. or else you can post the report which you will get by typing ipconfig/all command on command prompt.
Connect your ethernet cable from your Broadband modem into your laptop. Make sure you can browse webpages. Open the VPN software installed by your employer, and enter your login credentials assigned by your employer to authenicate. Once connected, you will have Network Access and Intranet Connections to your workplace. This will work from WiFi hotspots, hotels, Internet cafes, etc. If you do not yet have your VPN software installed, or have your credentials, speak to your employer as they may need to create and account and a certificate for your VPN connection.
there might be some problems and you have to go through them.
--> check the cable
--> check the vpn connection settings
--> check the server name
--> check the user name and password (it should be same as of your system in office
--> make sure your computer is on at work
i hope this will help you
if none of them work then the easy way is to make other connection that will definitly do