Ask the Expert

VPN connection issues post Windows XP SP2 upgrade

Our clients have two Cisco routers connected to the Internet and we configured them to allow PPTP-VPN access from our client's home. These configurations worked well with Windows 2000 and Windows XP SP1 PCs, but since we upgraded our clients PCs to Windows XP SP2, none of them can establish PPTP-VPN connections to the routers. We have done many tests, including deactivating the PC's firewall, but Windows XP SP2 PCs still fail to connect. What can I do to solve this problem?
I would verify your VPN settings on the routers to ensure that you are using ms-chap for your ppp authentication and that you have configured the ppp encrypt mppe command with the correct level of encryption (auto, 40bit or 128bit). For more information about configuring IOS based VPNs click here.

Click here to view questions and answers from all of our Windows security experts.

This was first published in May 2006

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: