I have a Win2K member server running ISA 2000. I have successfully configured the ISA server to allow incoming VPN connections using PPTP into our NT 4.0 domain. I have recently upgraded the domain to Win2K3 Active Directory and at the point of upgrade we lost incoming VPN ability. My clients get "Error 930: The authentication server did not respond to authentication requests in a timely fashion." This message appears _immediately_ upon connection attempt (no long timeout). I am using Windows Authentication and Windows Accounting (not RADIUS). I have added the ISA server to the RAS and IAS group and this did not correct the problem. I have battled this for two days and have made no progress. Any pointers or suggestions will be appreciated. Thank you, PESA Postmaster