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Remote authentication does not work with PPTP and MPPE - Most RADIUS servers don't support MPPE

Core issue

The RADIUS server does not support MPPE with PPTP.

Resolution

Few RADIUS servers support Microsoft Point-to-Point Encryption (MPPE).  To use the vpdn group group-name ppp encryption mppe command in the PIX, the RADIUS server must support MPPE.

MPPE is supported only in some RADIUS servers (not in TACACS+ servers). Three RADIUS servers that support MPPE are:

  • Cisco Secure 2.5 and later
  • Funk RADIUS
  • Microsoft IAS

Problem Type

Troubleshoot software feature

Connectivity to the device

Product Family

Firewall - PIX 500 series

PIX Software Version

PIX version 5.2

PIX version 4.1

PIX version 5.3

PIX version 4.2

PIX version 6.0

PIX version 4.3

PIX version 6.1

PIX version 4.4

PIX version 6.2

PIX version 5.0

PIX version 6.3

PIX version 5.1

PIX version 4.0

VPN Client Software Version

Point-to-Point Tunneling Protocol (PPTP) client

Client Location on Network with PIX

Outside

VPN Tunnel End Points

PIX

Any end point

Features & Tasks

RADIUS

VPN Protocols

Point-to-Point Tunneling Protocol (PPTP)

VPN Tunnel Initialization

Point-to-Point Tunneling Protocol (PPTP) session is not established

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