I have XP Pro running on a Lenovo Thinkpad T60. For 2 years, I've never had a problem with VPN. I regularly connect to 6 or 7 different VPN sites, which all use different logon info/domains.
Recently (about 2 months ago) it stopped being able to make VPN connections. It's running the same version of WinXP Pro, with the same service pack, and all of the same updates, and the same version of virus scanner as other machines in my office. And this is the only machine that has the problem.
All other network functionality works fine except VPN.
When I try to VPN, I get up though the registration step, and then I get
Error 720: Connection to the remote computer could not be established. You might need to change the network settings for this connection.
I've tried matching all VPN settings with a computer that will successfully connect (authentication, encryption, etc)
I've rebuilt the VPN connection.
I've turned off the firewall.
I've updated the network drivers.
I've uninstalled/rebooted/reinstalled the network driver.
I've updated windows
I've checked the symantec logs to make sure it didn't quarantine any files.
What else could be failing that would not allow my VPN to connect?
Thanks in advance for the help.