I have a Thinpad X60S using XP pro. I have been unable to the internet using dial-up networking. I have I have been scouring the internet for a solution to this problem but have found none. No firewall, though I use Juniper Network Connect 5.4.0 to connect to my work network.
1) Reinstalled VZ Access several times
2) Set up a manual connection with the Verizon ISP information
3) Confirmed with verizon rep that everything was set up properly. Connected successfully with the same DUN settings on my desktop.
4) Reset TCP/IP protocol as described in this forum
5) Uninstalled Thinkpad Access Connections
6) Reinstalled updated Access Connections
7) Updated every single thing I could think of
Basically, In my research, there is a particular variant of the Error 720 problem with IBM Thinkpads. The problem is located in the PPP protocols/WAN Miniport/ drivers TCP/IP protocols. I don't know anything, so you guys can tell me whether these are all the same or different parts of the DUN connection process.
Anyway, it appears as though either the 1) Thinkpad Access Connections Software screws it up or 2) the way the WAN Miniport drivers for OEM Windows XP are installed by IBM is different that with official Windows XP.
It seems as though dealing with #1 has helped some people, but for others #2 has been isolated as the culprit. I have searched around and reseting the TCP/IP does not work because it resets to the original, incapable IBM protocol. The other solution is apparently to do a clean reinstall of Windows XP. Obviously, I don't want to create another 2 days of work reinstalling everything on my laptop just so I can have broadband access via my verizon phone.
I hope this helps someone with more expertise than me to find an easier solution. A lot of people with Thinkpads, Verizon and OEM XP are suffering when it comes to dial up networking.