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radius authentication

I am trying to configure radius authentication on 'telnet' and 'enable sec' to a router connected on the same lan, ( -pc / - Router). I am using a stellbelt radius server on the same pc i telnet from and when i debug the router i receive the following:

Router#deb radius authentication

Radius protocol debugging is on

Radius packet hex dump debugging is off

Radius packet protocol debugging is on


04:12:40: RADIUS/ENCODE(00000008): ask "Username: "

04:12:40: RADIUS/ENCODE(00000008): send packet; GET_USER

04:12:44: RADIUS/ENCODE(00000008): ask "Password: "

04:12:44: RADIUS/ENCODE(00000008): send packet; GET_PASSWORD

04:12:46: RADIUS/ENCODE(00000008): acct_session_id: 5

04:12:46: RADIUS(00000008): sending

04:12:46: RADIUS: Send to unknown id 5, Access-Request, len 83

04:12:46: RADIUS: authenticator E4 49 3C 9B 64 02 6A E6 - 75 74 54 5C F2 8D 93


04:12:46: RADIUS: User-Name [1] 7 "cisco"

04:12:46: RADIUS: User-Password [2] 18 *

04:12:46: RADIUS: NAS-Port [5] 6 6

04:12:46: RADIUS: NAS-Port-Type [61] 6 Virtual [5]

04:12:46: RADIUS: Calling-Station-Id [31] 14 ""

04:12:46: RADIUS: Service-Type [6] 6 Login [1]

04:12:46: RADIUS: NAS-IP-Address [4] 6

04:12:46: RADIUS: Unsupported packet type

04:12:51: RADIUS: Retransmit id 5

04:12:51: RADIUS: Unsupported packet type

04:12:56: RADIUS: Retransmit id 5

04:12:56: RADIUS: Unsupported packet type

04:13:01: RADIUS: Retransmit id 5

04:13:01: RADIUS: Unsupported packet type

04:13:06: RADIUS: Tried all servers.

04:13:06: RADIUS: No valid server found. Trying any viable server

04:13:06: RADIUS: Tried all servers.

04:13:06: RADIUS: No response for id 5

04:13:06: RADIUS/DECODE: parse response no app start; FAIL

04:13:06: RADIUS/DECODE: parse response; FAIL

04:13:08: RADIUS/ENCODE(00000008): ask "Username: "

04:13:08: RADIUS/ENCODE(00000008): send packet; GET_USER

The config oin the router is as follows:

hostname Router


aaa new-model


aaa authentication login use-radius group radius

aaa authorization exec default group radius if-authenticated

aaa session-id common

enable secret 5 $1$h0.6$iS0Z6sa3EN8mVBmgXfTP70


radius-server host auth-port 1645 acct-port 1646

radius-server retransmit 3

radius-server key cisco


line con 0

login authentication use-radius

line aux 0

line vty 0 4

login authentication use-radius

The radius server is setup with the following:

RAS Clients

Client name: Router

IP address:

Make/Model: Cisco IOS 11.1 or later


User name: CISCO

User type: Native user

Pass: cisco


Re: radius authentication

Often times complex troubleshooting issues are best addressed in an interactive session with one of our trained technical assistance engineers. While other forum users may be able to help, it’s often difficult to do so for this type of issue.

To utilize the resources at our Technical Assistance Center, please visit and to open a case with one of our TAC engineers, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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