Information Technology Reference
In-Depth Information
debug isdn events
debug ppp negotiation
Authentication
Failed authentication is the single most common reason for a PPP failure. Misconfigured or mismatched
usernames and passwords create error messages in
debug
output.
The following example shows that the username Goleta does not have permission to dial in to the NAS,
which does not have a local username configured for this user. To fix the problem, use the
username
name
password
password
command to add the username Goleta to the NAS's local AAA database:
Mar 13 11:01:42.399: As2 LCP: State is Open
Mar 13 11:01:42.399: As2 PPP: Phase is AUTHENTICATING, by this end
Mar 13 11:01:42.399: As2 CHAP: O CHALLENGE id 1 len 28 from “Montecito”
Mar 13 11:01:42.539: As2 CHAP: I RESPONSE id 1 len 30 from “Goleta”
Mar 13 11:01:42.539: As2 CHAP: Unable to validate Response. Username Goleta not found
<SMALL>Mar 13 11:01:42.539: As2 CHAP: O FAILURE id 1 len 26 msg is “Authentication
fail</SMALL><SMALL>ure”</SMALL>
Mar 13 11:01:42.539: As2 PPP: Phase is TERMINATING
The following example shows that the username Goleta is configured on the NAS. However, the
password comparison failed. To fix this problem, use the
username
name
password
password
command
to specify the correct login password for Goleta:
Mar 13 11:04:06.843: As3 LCP: State is Open
Mar 13 11:04:06.843: As3 PPP: Phase is AUTHENTICATING, by this end
Mar 13 11:04:06.843: As3 CHAP: O CHALLENGE id 1 len 28 from “Montecito”
Mar 13 11:04:06.987: As3 CHAP: I RESPONSE id 1 len 30 from “Goleta”
Mar 13 11:04:06.987: As3 CHAP: O FAILURE id 1 len 25 msg is “MD/DES compare failed”
Mar 13 11:04:06.987: As3 PPP: Phase is TERMINATING
