Cant dial-up - Error 720

I`ve contacted them, after 4hours on the phone with senior technician, I tried 2 other ISP`s, same problem with all of them.

I`ve tried everything on http://www.modemhelp.net/vblite/showthread.php3?threadid=479. No luck.

Thank you.
Woerts

http://support.microsoft.com/default.aspx?scid=kb;en-us;314869

CAUSE
This behavior can occur if your computer and the RAS server do not have a protocol in common, or if RAS is not configured correctly.
RESOLUTION
To resolve this behavior, follow these steps:
Find out which protocols the RAS server is running, and make sure that the RAS service is installed and configured properly (or ask the Network Administrator to do this).
After you find out which protocols the RAS server is running, make sure that your Windows XP-based computer is running one of the same protocols that the RAS server is running:
Click Start, click Control Panel, and then double-click Network Connections.
Under Virtual Private Network, right-click the VPN connection, and then click Properties.
In the VPN Connection Properties dialog box, click the Networking tab, and make sure that you have a protocol that the RAS server is running.
If you do not have a protocol that the RAS server is running, add the needed protocol:
Click Install, click Protocol, and then click Add.
Click the protocol that you need to install, and then click OK.
Click Close in the VPN Connection Properties dialog box.

That applies if u are using VPN.

If not try recreating the dialup connectoid. Try this:

1.  Click Start, select Control Panel, and double-click Network  Connection.
2.  Choose Create a new connection in the left pane.
3.  Click Set up my connection manually and click Next.
4.  Click Connect using a Dial-Up modem and click Next.
5.  Type a name for the Internet Service Provider (ISP) that you are
    using in this connection and click Next.
6.  Type the phone number provided by your ISP and Click Next.
7.  Choose whether you want to share this connection with other users
    of the computer, or only for yourself.
8.  Enter the logon information provided by your ISP to access the
    service.
9.  Click Next and click Finish to end the setup process.
 
This will create an icon in Dial-Up Networking for you to connect with
your ISP.
 
Try reconnecting now.

This problem can occur for various reasons, usually involving the personal firewall. The most frequent culprit is DHCP.

If the modem worked on that machine previousely, then go to Start-->Control Panel-->System. Choose the "Hardware" tab and click on the "Hardware Profiles" button. Copy the current profile and name it something like "modem not working". Now click OK and OK again.

Now go to Start-->All Programs-->Accessories-->System Tools-->System Restore. Now go back to a system checkpoint on a date when it still worked. Follow the onscreen instructions and Restart. If your modem now dials in correctly, you can do one of two things 1. Save this as a new profile and compare to the "modem not working" profile to find out what the culprit was, or 2. If it's now working and you are not interested in the cause, carry on using the new hardware profile.

If the modem never worked on that machine go to Start-->Control Panel-->Administrative Tools. Now go to "Services" and make sure that "DHCP Client" is started and on automatic. Make sure that "DNS Client" is started and on automatic. Make sure that "Remote Access Connection Manager" is started and on manual. Make sure that "TCP/IP NetBIOS Helper" is started and on automatic. You can alter these one at a time to find the root cause, or do the whole lot and test it then.

That should get you back on track.

dragon63

This may also occur if TCP/IP is damaged or is not bound to your dial-up adapter.

RESOLUTION

How to Resolve Damaged TCP/IP
1. Click Start, point to Settings, click Control Panel, and then double-click Network.

2. Click TCP/IP that is bound to the dial-up adapter, and then click Remove.

3. This removes the TCP/IP protocol and the Client for Microsoft Networks (if this feature has been installed). Click OK.

4. Restart your computer.

5. Click Start, point to Settings, click Control Panel, and then double-click Network.

6. Click Add, and then double-click Protocols.

7. In the Manufacturers box, click Microsoft, and then double-click TCP/IP in the Network Protocols box.

8. Click OK, and then restart your computer.


How to Resolve Missing TCP/IP

1. Click Start, point to Settings, click Control Panel, and then double-click Network.

2. Click Add, and then double-click Protocols.

3. In the Manufacturers box, click Microsoft, and then double-click TCP/IP in the Network Protocols box.

4. Click OK, and then restart your computer.

woerts,
   We have not heard from you? Did any comment help you solve your problem? Do you have any more questions? If an Expert help you, please accept his/her answer and provide him with an excellent or good grade.

Thanks, war1

I have on another computer the Error 720 problem that has just appeared. I have read some of the comments fom other and they all talk about removing the TCP/IP with the remove button that I dont have. I run Windows XP Pro. and dial up through the computers modem and not through a server. I have contacted the ISP and they said everything there end is OK. I have copied the settings from my other laptop, which connects no problem.

Andy

http://www.modemsite.com/56k/duns720.asp to other soutions but this works the best for Windows XP!!

With Windows XP, you cannot re-install TCP/IP, but you can reset it with the following DOS command:

Click Start, then Run..., and put the following in the Open text box (or enter the following from a DOS command prompt which you can get by Start->Run-> cmd)
netsh int ip reset resetlog.txt

Thank You
Jon

I am experiencing the same issues with the following computers, Lenovo T61, T60 and Lenovo 3000 N100 laptops, Here is a list of instructions that work for me for about 15 machines now and I think I got it pretty close. I've read alot on this issue and have done about 6 months of troubleshooting to come up with this solution.

VPN Error 720: No PPP control protocols configured

To resolve this issue, remove the WAN Miniport IP and the WAN Miniport PPTP device, and then reinstall both Miniports.

1.      Delete the VPN/dial-up connection
2.      Click Start, click Run, type regedit in the Open box, and then click OK.
3.      Locate the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}
4.      On the File menu, click Export& choose a destination and give it a name, and then click Save.
5.      Click each of the registry subkeys under this key, and then view the Data column of the DriverDesc value to determine which of the subkeys corresponds to WAN Miniport (IP). And the one that corresponds with WAN Miniport (PPTP). For example, the 0005 and 0008 subkeys.
6.      Right-click the subkey whose DriverDesc value data is WAN Miniport (IP) (for example, right-click 0005), and then click Delete. Click Yes to confirm that you want to delete the key. Then do the same for the subkey whose DriverDesc value data is WAN Miniport (PPTP).
7.      Close Registry Editor
8.      Right-click My Computer, and then click Properties.
9.      Click the Hardware tab, and then click Device Manager.
10.      On the View menu, click Show hidden devices.
11.      Under Network adapters, right-click WAN Miniport (IP) and then click Uninstall. Click OK to confirm that you want to remove this device. Repeat this step for WAN Miniport (PPTP) as well.
12.      Reboot the PC
13.      Find netrasa.inf in C:\Windows\inf, Open and place a semicolon in front of the line that starts "Excludefromselect=\" and end with "MS_NdisWanNbfIn,MS_NdisWanNbfOut" under the [ControlFlags] section. (all lines between)
14.      Click Start then Control Panel.
15.      Go to Add Hardware.
16.      Click Next, then select Yes I have already connected the hardware, then click Next.
17.      Scroll down and select Add a new Hardware device, click Next.
18.      Select Install the Hardware that I manually select from a list (Advanced), click Next then select Network Adapter in the list and select Next.
19.      Select Microsoft in the left column and then select WAN Miniport (PPTP) and click Next
20.      Select Continue Anyway, Click Finish and close out of everything. Now do the same thing for  WAN Miniport (IP).
21.      Uninstall, then Reinstall network adapters.
22.      Click Start, Run, type in netsh int ip reset resetlog.txt and click ok
23.      Reboot the PC.
24.      Uninstall and reinstall the VPN/dial-up connection and this should fix the issue.

Some times I have to repeat steps 22 and 23 a 2nd time for it to work. Let me know if this was any help or any other errors that occured after attempting the steps above.