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I have a few different VPNs I need to connect to. I'm using windows 8 and standard ptpp VPN. Every VPN I have created though results in the same error:

Error 720: A connection to the remote computer could not be established You might need to change the network settings for this connection

The VPN works in Windows 7 and XP. I'm not sure if this has something to do with my new laptop or if its something with Windows 8 itself. Any help would be greatly appreciated and if there is any extra info I can provide please let me know.

Edit:
I've tried with virus scanner turned off and windows firewall turned off as well and I still receive the same error message.

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migrated from serverfault.com Dec 29 '12 at 11:37

This question came from our site for system and network administrators.

    
Needs more details. A lot more details. And may be more suitable for SuperUser anyhow... doesn't seem like it's a professional admin problem, at least as described. –  HopelessN00b Dec 29 '12 at 0:40
    
thanks HopelssN00b, I'm not sure what info to provide that will be most helpful, if you let me know what info you need I can try and provide it. I'm happy to move to super user if that will be more appropriate. –  campo Dec 29 '12 at 1:13
    
I don't know either, but look at what you have provided us - basically that a bunch of your PTPP VPNs throw a 720 error when you use Windows 8. Uh, alright, but that doesn't have any information that's going to be much good for troubleshooting. –  HopelessN00b Dec 29 '12 at 1:22

7 Answers 7

Got this problem after migrating from Windows 8 to Windows 8.1. It was due to altered miniports which had to be reinstalled.

Here is how I managed to do so:

  1. Locate broken miniports [yellow icon]: Device Manager -> View -> Show hidden devices. I had for example 3 bad miniports: WAN Miniport (IP), WAN Miniport (IPv6) and WAN Miniport (Network Monitor).
  2. Regedit -> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e972-e325-11ce-bfc1-08002be10318} -> Export. In the generated .reg file, locate the broken miniports. You will then identify all the subkeys which need to be deleted [for example in my case, subkeys 0039, 0041 and 0042]. Double check that those subkeys has a "DriverDesc" which matches our broken miniports... And delete those subkeys.
  3. Go back in Device Manager, and right click on a broken miniport, then "Update Driver Software" -> "Browse my computer" -> "Let me pick driver from a list" -> uncheck "Show compatible hardware" and wait for drivers listing generation... Then pick the first "Microsoft" drivers listed [BlueTooth Personal], and ignore warnings. The broken and undeletable miniport will then become a fake bluetooth card, which you will be able to delete.
  4. Repeat point 3 for all broken miniports.
  5. And reboot the system. The OS will create again its miniports from scratch.
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This worked for me - though step 2 wasn't necessary. Uninstalling the 'Bluetooth Personal' driver had the same effect. –  David Gardiner Nov 11 at 0:55

It might not be the issue with your VPN but with VPN server. It's possible that your IP address is out of the incoming IP address range defined on the VPN server

  • Go to Network and Sharing Center -> Change Adapter Settings
  • Right-click Incoming Connections, and then Properties
  • Click on the Networking tab and double click on the Internet Protocol Version 4 (TCP/IPv4)
  • Click the Specify IP addresses and change/expand an IP range so that include the IPs of your devices, or just change IP addresses on your machines to fit the already defined range

enter image description here

If that was the issue, your VPN should work

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I have the same problem, please see:

http://social.technet.microsoft.com/Forums/en-US/w8itpronetworking/thread/783d8384-8880-494b-b011-7cc85ec6919d

http://forums.lenovo.com/t5/Windows-8/Windows-8-VPN-720-error-after-installing-some-of-the-lenovo/td-p/989573

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2  
On SU you may be asked to amplify an answer to at least a little more than just links (that may die later). For example, you had the problem, how did you fix it / pitfalls to watch out for etc? –  pnuts Jan 16 '13 at 17:27

Here is the a solution for you for your error 720 vpn windows 8. Try this link below

http://techslate.net/windows-8-error-720-problem-with-connection/

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It is caused by broken WAN miniports install (You can see yellow exclamation mark next to the WAN Miniport devices in Device manager). I created simple tool which uninstalls all WAN miniports and installs them again, so VPN and Dial-up connections work again. You can find it at Wan miniport repair tool

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To make VPN work & fix broken / yellow warning WAN miniport's (virtual devices created by local services)

Stop Local service "Remote Access Connection Manager" & set to manual

Now in device manager miniports should disappear (if not you can update driver to "Generic Mobile Bandwidth adapter" or something like this when unchecking compatible hardware @ driver installation, then when it installs wrong device it should be uninstallable)

Next get devcon.exe from Microsoft (Driver Development Kit)

Then run:

devcon.exe install c:\windows\inf\netrasa.inf <hardwareId>

With each of these
<hardwareId> = 
MS_NdisWanIp
MS_NdisWanIpv6
MS_L2tpMiniport
MS_NdisWanBh
MS_PppoeMiniport
MS_PptpMiniport
MS_SstpMiniport (this is depending on Secure Socket Tunnelling Service, so make sure it is stopped)

Then you will have "Unknown device" in Device manager

Then Restart PC

Start service "Remote Access Connection Manager"

Now you should be able to connect VPN with working miniports (it is not necessary to have all miniports working, but just those required to specific VPN type of connection)

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What the solution ended up being for me was a bad driver. Windows 8.1 installed a generic Broadcom driver on my PC. After going to Dell's support site and updating the driver to one that was specific to my laptop, the VPN worked without issue. I would guess that this would be the same for other brands.

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