VPN Error 720 on Registering Computer on the Network

Hello All

All of a sudden I am facing this problem - when ever I try to establish a VPN connection to my office, I get Error 720 on registering computer on the network, however, I tried resetting the TCP/IP using netsh toold and also reset'd the winsock using netsh. Further more, I have also tried various solutions provided on the Microsoft knowledge base articles, but I cannot login to my system.

However, I have made the same kind of connection on another system, and it works perfectly, but for some odd reason, when ever I try to use my laptop, I get this error. I was able to connect previously, since the past week, I am getting this error and I have exhausted all of resources....

Thanks in advance!
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caddladyConnect With a Mentor Commented:
shkhurramAuthor Commented:
Forgot to mention, that my laptop is running Windows XP Pro SP2 and I am connecting to a VPN device rather than a server.

My Desktop system is also using Windows XP Pro SP2 and is able to connect to the VPN device using the same connection parameters.
What is the exact error?

Error 720: No PPP control protocols configured  ?
Are you using a wireless adapter in your laptop?
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shkhurramAuthor Commented:
yes that's one of the error, it's either this, or "Error 720: A connection to the remote computer could not be established. You might need to change the network settings for this connection..."

And yes I am using the wireless adapter, however, I have even tried the ethernet adapter as well. It still would'nt work. I have also tried the following: At home I have configured my windows xp desktop system to accept incoming connections via vpn, i cannot connect to my desktop system from my Laptop using the LAN IP addresses, but I am able to connect to my desktop via VPN using my friends laptop or my brother's desktop machine, so i know it's not the network or VPN server at my work, it has something to do with my laptop.

Re-installing windows option have crossed my mind, but I think this problem can be repaired without using this method.

Secondly, the following things are installed on my each network adaptor

Client for Microsoft Networks
File and Printer Sharing for Microsoft Networks
Internet Protocol (TCP/IP)

I have also used the WinsockXPfix utility.

I was able to connect from my laptop about a month ago, and I have not installed or removed anything from it, but for someodd reason, it won't connect.
shkhurramAuthor Commented:
of all the articles on the net, i think i missed this one, and it worked! cheers mate!! if i could award "n" number of points I would'nt hesitate for a bit!!!

I just spent hours trying everything i could to fix this, finally came across the fix.

Problem OS: Windows XP SP3
Errors: When connecting to Windows PPTP VPN, it never connects and eventually gives you a error 720

Problem Explained : Windows PPTP VPN connection never connects and fails with this 720 error. Internet and everything else works fine. I checked the RAS server and other users on the same version fo windows from the same lcoation were connecting just fine, I double checked the users credentials, those were fine. I ran winsock repairs, TCP/IP repairs, netsh repairs, reinstalled drivers, removed miniport wan registry keys and reinstalled them following microsoft's repair for this problem stated on this page- http://support.microsoft.com/kb/123298<<<< - Did not work
http://support.microsoft.com/kb/314869<<<< - Did not work
NONE of them worked- I almost decided to Reinstall windows.

If all else is failing then your WAN Miniport drivers might be corrupted- this is how you reinstall them-
Here's the actual fix to this problem:
Go to this web page and download DEVCON.EXE- google it if my link doesn't work. http://support.microsoft.com/kb/311272

Extract the package to C:\Devcon
After extraction is complete
Open the command prompt and change your directory to be in C:\Devcon\i386 by using the cd command to change directories.
Once you are in that directory, run this command
devcon.exe install %windir%\inf\netrasa.inf MS_NdisWanIp

So your command line should look like this
C:\Devcon\i386>devcon.exe install %windir%\inf\netrasa.inf MS_NdisWanIp and hit enter
it will compute a couple items and when completed, reboot.
Afterwards the VPN will connect again.

The MS_NdisWanIp in my case was corrupted, you could run each or any of the following to fix any of the rest of them as well. They are as followed
devcon.exe install %windir%\inf\netrasa.inf MS_PptpMiniport
devcon.exe install %windir%\inf\netrasa.inf MS_L2tpMiniport
devcon.exe install %windir%\inf\netrasa.inf MS_PtiMiniport
devcon.exe install %windir%\inf\netrasa.inf MS_PppoeMiniport
Hope this helps all that are lost and frusterated!
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