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6.8

ERROR: Authentication Server not responding: unknown, Windows Event Log, IAS Warning, Event ID 2, authentication failure

Asked by Sma11T0wnITGuy in IPSec Security Protocol, Virtual Private Networking (VPN), Windows 2000 Operating System

Tags: ias, server, authentication

Hi folks,

I'm installing a Cisco ASA 5510 and I want my users to VPN in using the Cisco Client and IPSec, authenticating to a Windows 2000 RADIUS Server.

This is my first ASA install, and I'm not too skilled with Windows 2000 RADIUS/AAA.  I should be able to make sure aaa authentication from the ASA to the Windows 2000 Server works.  When I try to test that using the test aaa-server authentication command on the ASA, I get the following errors:

Cisco:

firewall# show debug
debug radius session
debug radius decode
firewall# test aaa-server authentication InternalAuth
Server IP Address or name: 192.168.1.7
Username: tleroy
Password: ***********
INFO: Attempting Authentication test to IP address <192.168.1.7> (timeout: 12 se
conds)
radius mkreq: 0x39
alloc_rip 0x42d8084
    new request 0x39 --> 11 (0x42d8084)
got user ''
got password
add_req 0x42d8084 session 0x39 id 11
RADIUS_REQUEST
radius.c: rad_mkpkt

RADIUS packet decode (authentication request)

--------------------------------------
Raw packet data (length = 64).....
-deleted-

Parsed packet data.....
Radius: Code = 1 (0x01)
Radius: Identifier = 11 (0x0B)
Radius: Length = 64 (0x0040)
Radius: Vector: 8AFB187156D7C4ADE27330A92ECF5C65
Radius: Type = 1 (0x01) User-Name
Radius: Length = 8 (0x08)
Radius: Value (String) =
-deleted-
Radius: Type = 2 (0x02) User-Password
Radius: Length = 18 (0x12)
Radius: Value (String) =
-deleted-
Radius: Type = 4 (0x04) NAS-IP-Address
Radius: Length = 6 (0x06)
Radius: Value (IP Address) = 192.168.1.25 (0xC0A80119)
Radius: Type = 5 (0x05) NAS-Port
Radius: Length = 6 (0x06)
Radius: Value (Hex) = 0xB
Radius: Type = 61 (0x3D) NAS-Port-Type
Radius: Length = 6 (0x06)
Radius: Value (Hex) = 0x5
send pkt 192.168.1.7/1645
rip 0x42d8084 state 7 id 11
rad_vrfy() : bad req auth
rad_procpkt: radvrfy fail
RADIUS_DELETE
remove_req 0x42d8084 session 0x39 id 11
free_rip 0x42d8084
radius: send queue empty
ERROR: Authentication Server not responding: unknown
firewall#

On the Windows 2000 Domain Controller/RADIUS/IAS Server, I get the following errors:

Event Type:      Failure Audit
Event Source:      Security
Event Category:      Account Logon
Event ID:      681
Date:            9/21/2007
Time:            12:04:02 PM
User:            NT AUTHORITY\SYSTEM
Computer:      LSIADC01
Description:
The logon to account: tleroy
 by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
 from workstation:
 failed. The error code was: 3221225578
 
Event Type:      Failure Audit
Event Source:      Security
Event Category:      Logon/Logoff
Event ID:      529
Date:            9/21/2007
Time:            12:04:02 PM
User:            NT AUTHORITY\SYSTEM
Computer:      LSIADC01
Description:
Logon Failure:
       Reason:            Unknown user name or bad password
       User Name:      tleroy
       Domain:            LSISOLUTIONS
       Logon Type:      3
       Logon Process:      IAS
       Authentication Package:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
       Workstation Name:       

Event Type:      Warning
Event Source:      IAS
Event Category:      None
Event ID:      2
Date:            9/21/2007
Time:            12:04:02 PM
User:            N/A
Computer:      LSIADC01
Description:
User tleroy was denied access.
 Fully-Qualified-User-Name = LSISOLUTIONS\tleroy
 NAS-IP-Address = 192.168.1.25
 NAS-Identifier = <not present>
 Called-Station-Identifier = <not present>
 Calling-Station-Identifier = <not present>
 Client-Friendly-Name = firewall
 Client-IP-Address = 192.168.1.25
 NAS-Port-Type = Virtual
 NAS-Port = 0
 Policy-Name = <undetermined>
 Authentication-Type = PAP
 EAP-Type = <undetermined>
 Reason-Code = 16
 Reason = There was an authentication failure because of an unknown user name or a bad password.  

I suspect I'm missing something on my RADIUS Server that will allow it to check Active Directory for my credentials, but I haven't figured it out yet.

Please post if you know of a tutorial, or have had a similar situation and have been able to resolve it.

Sincerely,

Ted
[+][-]09/25/07 11:04 AM, ID: 19957664Accepted Solution

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About this solution

Zones: IPSec Security Protocol, Virtual Private Networking (VPN), Windows 2000 Operating System
Tags: ias, server, authentication
Sign Up Now!
Solution Provided By: llyquid
Participating Experts: 4
Solution Grade: A
 
[+][-]09/21/07 05:07 PM, ID: 19939945Expert Comment

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