May 11, 2020
How to fix Error 1720 (Cisco Vpn Client Error 1720 About The Author: Phil Hart has been a Microsoft Community Contributor since 2010. With a current point score over 100,000, they've contributed more than 3000 answers in the Microsoft Support forums and have created almost 200 new help articles in the Technet Wiki. Error 1720 When installing Cisco VPN client on windows Jun 12, 2009 Tech4dreams: Cisco VPN Client Error 1720 Sep 27, 2013
CISCO VPN Client Software on Windows Vista
How to fix Error 1720 (Cisco Vpn Client Error 1720 About The Author: Phil Hart has been a Microsoft Community Contributor since 2010. With a current point score over 100,000, they've contributed more than 3000 answers in the Microsoft Support forums and have created almost 200 new help articles in the Technet Wiki.
Jun 12, 2009
Try Cisco's VPN client software (which you also need a higher level of access to download) on your NT and 9x clients rather than creating a RAS VPN DUN connection. I don't know if it will handle the domain authentication piece (in addition to authenticating to the router). Use a RADIUS server other than IAS.