The Remote Authentication Dial-In User Service (RADIUS) is a client/server security protocol created by Lucent InterNetworking Systems. RADIUS is an Internet draft standard protocol.
User profiles are stored in a central location, known as the RADIUS server. RADIUS clients communicate with the RADIUS server to authenticate users. The server specifies back to the client what the authenticated user is authorized to do. Although the term RADIUS refers to the network protocol that the client and server use to communicate, it is often used to refer to the entire client/server system.
The authentication server is not responding affirmatively to the PIX Firewall request.
The authentication server is not sending Microsoft Point-to-Point Encryption (MPPE) keying material (attribute 26=0X1A).
To resolve this issue, perform these steps:
Check for these items:
The remote connection works with encryption off
The remote connection fails with encryption on
The connection works with local authentication with encryption
If these statements are true, the problem may be that the RADIUS server is not returning proper MPPE keying material. Make sure that the authentication server is responding affirmatively to the PIX Firewall request and is sending MPPE keying material (attribute 26=0X1A).
If you have verified that the authentication server is responding affirmatively to the PIX Firewall request and is sending MPPE keying material (attribute 26=0X1A), but the PIX still indicates a failure, gather this output and open a service request with Cisco Technical Support:
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