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
