Problems with PAP and CHAP Authentication

PAP and CHAP authentication are used to prevent unauthorized clients from connecting to the server. If either of these authentication methods is enabled on the server, your system administrator or Internet provider will provide you with the relevant passwords and identifiers.

The following log file extract shows what happens when your client fails to respond to a request for authentication:

11/14/95 10:22:41 - Connection requested to miles
11/14/95 10:22:42 - Dialing number P365 ...
11/14/95 10:23:16 - Got modem connection
11/14/95 10:23:47 - PPP error on ipdptp0: Maximum number of
configure requests exceeded

In this example, the server requested PAP authentication and the client rejected the request. After a specified number of requests, the server broke the connection without starting the PPP negotiation.

The following log file extract shows what happens when the client responds to the request for authentication with the wrong password:

11/13/95 20:34:42 - Connection requested to miles
11/13/95 20:34:43 - Dialing number P365 ...
11/13/95 20:35:16 - Got modem connection
11/13/95 20:35:19 - LCP up on ipdptp0
11/13/95 20:35:19 - PPP error on ipdptp0: Negotiation of mandatory
options failed

In this example, the PPP negotiation fails and the server closes the connection automatically.