What are some known compatibility issues with the Microsoft PPTP products and the VPN 3000 Concentrator?
A. This information is based on VPN 3000 Series Concentrator software releases 3.5 and later; VPN 3000 Series Concentrators, Models 3005, 3015, 3030, 3060, 3080; and Microsoft Operating Systems Windows 95 and later. • Windows 95 Dial-Up Networking (DUN) 1.2 Microsoft Point-to-Point Encryption (MPPE) is not supported under DUN 1.2. Install Windows 95 DUN 1.3 to connect using MPPE. You can download the Microsoft DUN 1.3 upgrade from the Microsoft web site. • Windows NT 4.0 Windows NT is fully supported for PPTP connections to the VPN Concentrator. Service Pack 3 (SP3) or later is required. If you run SP3, install the PPTP Performance and Security patches. Refer to Microsoft’s web site for information about the PPTP Performance and Security Upgrade for WinNT 4.0 . The only resolution for this is to reinstall the NT 4.0 Server Option Pack without adding the Service Pack afterwards. Note: The 128-bit Service Pack 5 does not handle MPPE keys correctly, and PPTP can fail to pass data. When th
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