Integration problem between Cisco Seure ACS 4.2 with LDAP

Hi expert,
I have a problem with the integration between Cisco Secure ACS 4.2 with SUN Java System Directory (LDAP). During the integration, I noticed that user failed to authenticate against LDAP via Cisco Secure ACS. The error message is "Authentication Type is not supported by external DB". In this case the "external DB" refer to LDAP. Anyone of you having an experience on integration on both product before? Can any of you give me some pointers about this. Attached are both screen capture on my ACS server.
Thanks very much,
Daniel

Hi,
Thanks for the compatibility chart. Oh dear ..., it seems that the LDAP does not supports PEAP (EAP-MS CHAPv2) at all. Am not sure if the latest LDAP (particularly for SUN Java System Directory) able to support this authentication protocol.
Just to clarify with you all just in case if you wonder what I'm trying to do; our company wants to implement 802.1x over the network. So, every staff on the network must authenticated before able to access the network resources. Our Linksys switches supports this standard including Cisco switches of course. Our RADIUS server is Cisco Secure ACS 4.2 but all those users information including username and passwords are stored in our directory server (LDAP) which is SUN Java System Directory.
Since most of our staff machines are running on XP and Vista, the only available authentication method (beside certificate based) is PEAP (EAP-MSCHAPv2). Based on the compatibility chart, the generic LDAP does not supports this authentication protocol as what we noted the "authentication type not supported by external database" error message in the ACS logs.
From what I learned that the latest LDAP (version 3.0?) able to support this authentication protocol, but yet to be confirmed on my further research.
So... Anyone can advice me on this matter? Thanks very much !

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Looking for successful auth debug between cisco 1113 acs 4.2 and Active Directory

Hello,
Does anyone have a successful authentication debug using cisco 1113 acs 4.2 and Active Directory? I'm not having success in setting this up and would like to see what a successful authentication debug looks. Below is my current situation:
Oct 6 13:52:23: TPLUS: Queuing AAA Authentication request 444 for processing
Oct 6 13:52:23: TPLUS: processing authentication start request id 444
Oct 6 13:52:23: TPLUS: Authentication start packet created for 444()
Oct 6 13:52:23: TPLUS: Using server 110.34.5.143
Oct 6 13:52:23: TPLUS(000001BC)/0/NB_WAIT/46130160: Started 5 sec timeout
Oct 6 13:52:23: TPLUS(000001BC)/0/NB_WAIT: socket event 2
Oct 6 13:52:23: T+: Version 192 (0xC0), type 1, seq 1, encryption 1
Oct 6 13:52:23: T+: session_id 763084134 (0x2D7BBD66), dlen 26 (0x1A)
Oct 6 13:52:23: T+: type:AUTHEN/START, priv_lvl:15 action:LOGIN ascii
Oct 6 13:52:23: T+: svc:LOGIN user_len:0 port_len:6 (0x6) raddr_len:12 (0xC) data_len:0
Oct 6 13:52:23: T+: user:
Oct 6 13:52:23: T+: port: tty515
Oct 6 13:52:23: T+: rem_addr: 10.10.10.10
Oct 6 13:52:23: T+: data:
Oct 6 13:52:23: T+: End Packet
Oct 6 13:52:23: TPLUS(000001BC)/0/NB_WAIT: wrote entire 38 bytes request
Oct 6 13:52:23: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:23: TPLUS(000001BC)/0/READ: Would block while reading
Oct 6 13:52:23: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:23: TPLUS(000001BC)/0/READ: read entire 12 header bytes (expect 16bytes data)
Oct 6 13:52:23: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:23: TPLUS(000001BC)/0/READ: read entire 28 bytes response
Oct 6 13:52:23: T+: Version 192 (0xC0), type 1, seq 2, encryption 1
Oct 6 13:52:23: T+: session_id 763084134 (0x2D7BBD66), dlen 16 (0x10)
Oct 6 13:52:23: T+: AUTHEN/REPLY status:4 flags:0x0 msg_len:10, data_len:0
Oct 6 13:52:23: T+: msg: Username:
Oct 6 13:52:23: T+: data:
Oct 6 13:52:23: T+: End Packet
Oct 6 13:52:23: TPLUS(000001BC)/0/46130160: Processing the reply packet
Oct 6 13:52:23: TPLUS: Received authen response status GET_USER (7)
Oct 6 13:52:30: TPLUS: Queuing AAA Authentication request 444 for processing
Oct 6 13:52:30: TPLUS: processing authentication continue request id 444
Oct 6 13:52:30: TPLUS: Authentication continue packet generated for 444
Oct 6 13:52:30: TPLUS(000001BC)/0/WRITE/46130160: Started 5 sec timeout
Oct 6 13:52:30: T+: Version 192 (0xC0), type 1, seq 3, encryption 1
Oct 6 13:52:30: T+: session_id 763084134 (0x2D7BBD66), dlen 15 (0xF)
Oct 6 13:52:30: T+: AUTHEN/CONT msg_len:10 (0xA), data_len:0 (0x0) flags:0x0
Oct 6 13:52:30: T+: User msg: <elided>
Oct 6 13:52:30: T+: User data:
Oct 6 13:52:30: T+: End Packet
Oct 6 13:52:30: TPLUS(000001BC)/0/WRITE: wrote entire 27 bytes request
Oct 6 13:52:30: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:30: TPLUS(000001BC)/0/READ: read entire 12 header bytes (expect 16bytes data)
Oct 6 13:52:30: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:30: TPLUS(000001BC)/0/READ: read entire 28 bytes response
Oct 6 13:52:30: T+: Version 192 (0xC0), type 1, seq 4, encryption 1
Oct 6 13:52:30: T+: session_id 763084134 (0x2D7BBD66), dlen 16 (0x10)
Oct 6 13:52:30: T+: AUTHEN/REPLY status:5 flags:0x1 msg_len:10, data_len:0
Oct 6 13:52:30: T+: msg: Password:
Oct 6 13:52:30: T+: data:
Oct 6 13:52:30: T+: End Packet
Oct 6 13:52:30: TPLUS(000001BC)/0/46130160: Processing the reply packet
Oct 6 13:52:30: TPLUS: Received authen response status GET_PASSWORD (8)
Oct 6 13:52:37: TPLUS: Queuing AAA Authentication request 444 for processing
Oct 6 13:52:37: TPLUS: processing authentication continue request id 444
Oct 6 13:52:37: TPLUS: Authentication continue packet generated for 444
Oct 6 13:52:37: TPLUS(000001BC)/0/WRITE/46130160: Started 5 sec timeout
Oct 6 13:52:37: T+: Version 192 (0xC0), type 1, seq 5, encryption 1
Oct 6 13:52:37: T+: session_id 763084134 (0x2D7BBD66), dlen 16 (0x10)
Oct 6 13:52:37: T+: AUTHEN/CONT msg_len:11 (0xB), data_len:0 (0x0) flags:0x0
Oct 6 13:52:37: T+: User msg: <elided>
Oct 6 13:52:37: T+: User data:
Oct 6 13:52:37: T+: End Packet
Oct 6 13:52:37: TPLUS(000001BC)/0/WRITE: wrote entire 28 bytes request
Oct 6 13:52:37: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:37: TPLUS(000001BC)/0/READ: read entire 12 header bytes (expect 33bytes data)
Oct 6 13:52:37: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:37: TPLUS(000001BC)/0/READ: read entire 45 bytes response
Oct 6 13:52:37: T+: Version 192 (0xC0), type 1, seq 6, encryption 1
Oct 6 13:52:37: T+: session_id 763084134 (0x2D7BBD66), dlen 33 (0x21)
Oct 6 13:52:37: T+: AUTHEN/REPLY status:7 flags:0x0 msg_len:27, data_len:0
Oct 6 13:52:37: T+: msg: Error during authentication
Oct 6 13:52:37: T+: data:
Oct 6 13:52:37: T+: End Packet
Oct 6 13:52:37: TPLUS(000001BC)/0/46130160: Processing the reply packet
Oct 6 13:52:37: TPLUS: Received Authen status error
Oct 6 13:52:37: TPLUS(000001BC)/0/REQ_WAIT/46130160: timed out
Oct 6 13:52:37: TPLUS(000001BC)/0/REQ_WAIT/46130160: No sock_ctx found while handling request timeout
Oct 6 13:52:37: TPLUS: Choosing next server 101.34.5.143
Oct 6 13:52:37: TPLUS(000001BC)/1/NB_WAIT/46130160: Started 5 sec timeout
Oct 6 13:52:37: TPLUS(000001BC)/46130160: releasing old socket 0
Oct 6 13:52:37: TPLUS(000001BC)/1/46130160: Processing the reply packet
Oct 6 13:52:49: TPLUS: Queuing AAA Authentication request 444 for processing
Oct 6 13:52:49: TPLUS: processing authentication start request id 444
Oct 6 13:52:49: TPLUS: Authentication start packet created for 444()
Oct 6 13:52:49: TPLUS: Using server 172.24.5.143
Oct 6 13:52:49: TPLUS(000001BC)/0/NB_WAIT/46130160: Started 5 sec timeout
Oct 6 13:52:49: TPLUS(000001BC)/0/NB_WAIT: socket event 2
Oct 6 13:52:49: T+: Version 192 (0xC0), type 1, seq 1, encryption 1
Oct 6 13:52:49: T+: session_id 1523308383 (0x5ACBD75F), dlen 26 (0x1A)
Oct 6 13:52:49: T+: type:AUTHEN/START, priv_lvl:15 action:LOGIN ascii
Oct 6 13:52:49: T+: svc:LOGIN user_len:0 port_len:6 (0x6) raddr_len:12 (0xC) data_len:0
Oct 6 13:52:49: T+: user:
Oct 6 13:52:49: T+: port: tty515
Oct 6 13:52:49: T+: rem_addr: 10.10.10.10
Oct 6 13:52:49: T+: data:
Oct 6 13:52:49: T+: End Packet
Oct 6 13:52:49: TPLUS(000001BC)/0/NB_WAIT: wrote entire 38 bytes request
Oct 6 13:52:49: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:49: TPLUS(000001BC)/0/READ: Would block while reading
Oct 6 13:52:49: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:49: TPLUS(000001BC)/0/READ: read entire 12 header bytes (expect 43bytes data)
Oct 6 13:52:49: TPLUS(000001BC)/0/READ: socket event 1
Oct 6 13:52:49: TPLUS(000001BC)/0/READ: read entire 55 bytes response
Oct 6 13:52:49: T+: Version 192 (0xC0), type 1, seq 2, encryption 1
Oct 6 13:52:49: T+: session_id 1523308383 (0x5ACBD75F), dlen 43 (0x2B)
Oct 6 13:52:49: T+: AUTHEN/REPLY status:4 flags:0x0 msg_len:37, data_len:0
Oct 6 13:52:49: T+: msg: 0x0A User Access Verification 0x0A 0x0A Username:
Oct 6 13:52:49: T+: data:
Oct 6 13:52:49: T+: End Packet
Oct 6 13:52:49: TPLUS(000001BC)/0/46130160: Processing the reply packet
Oct 6 13:52:49: TPLUS: Received authen response status GET_USER (7)
The 1113 acs failed reports shows:
External DB is not operational
thanks,
james

Hi James,
We get External DB is not operational. Could you confirm if under External Databases > Unknown User Policy, and verify you have the AD/ Windows database at the top?
this error means the external server might not correctly configured on ACS external database section.
Another point is to make sure we have remote agent installed on supported windows server.
http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_server_for_solution_engine/4.2/installation/guide/remote_agent/rawi.html#wp289013
Also provide the Auth logs from the server running remote agent, e.g.:-
AUTH 10/25/2007 15:21:31 I 0376 1276 External DB [NTAuthenDLL.dll]:
Attempting Windows authentication for user v-michal
AUTH 10/25/2007 15:21:31 E 0376 1276 External DB [NTAuthenDLL.dll]: Windows
authentication FAILED (error 1783L)
thanks,
Vinay

Cisco Secure ACS 4.2 with Oracle

hi there...
Our campus using WisM (WS-SVC-WISM-1-K9) as wireless controller , Cisco 1130 access point and Cisco Secure ACS 4.2 Solution Engine 1113 Appliance as radius server. For username and password, ACS will export the data from Oracle database(production DB).
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My questions :
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2- Is there any option to tackle the encrypted password? Can ACS handle the "Oracle Stored Procedures" function?
Please advice.
Thanks

Microsoft SQL Server and Case-Sensitive Passwords
If you want your passwords to be case sensitive and are using Microsoft SQL Server as your ODBC-compliant relational database, configure your SQL Server to accommodate this feature. If your users are authenticating by using PPP via PAP or Telnet login, the password might not be case sensitive, depending on how you set the case-sensitivity option on the SQL Server. For example, an Oracle database will default to case sensitive, whereas Microsoft SQL Server defaults to case insensitive. However, in the case of CHAP/ARAP, the password is case sensitive if you configured the CHAP stored procedure.
For example, with Telnet or PAP authentication, the passwords cisco or CISCO or CiScO will all work if you configure the SQL Server to be case insensitive.
For CHAP/ARAP, the passwords cisco or CISCO or CiScO are not the same, regardless of whether the SQL Server is configured for case-sensitive passwords.
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The following example routine creates a procedure named CSNTAuthUserPap in Microsoft SQL Server, the default procedure that ACS uses for PAP authentication. Table and column names that could vary for your database schema appear in variable text. For your convenience, the ACS product CD includes a stub routine for creating a procedure in SQL Server or Oracle. For more information about data type definitions, procedure parameters, and procedure results, see ODBC Database.
                         if exists (select * from sysobjects where id = object_id (`dbo.CSNTAuthUserPap') and
                         sysstat & 0xf = 4)drop procedure dbo.CSNTAuthUserPap
                         GO
                         CREATE PROCEDURE CSNTAuthUserPap
                         @username varchar(64), @pass varchar(255)
                         AS
                         SET NOCOUNT ON
                         IF EXISTS( SELECT username
                         FROM users
                         WHERE username = @username
                         AND csntpassword = @pass )
                         SELECT 0,csntgroup,csntacctinfo,"No Error"
                         FROM users
                         WHERE username = @username
                         ELSE
                         SELECT 3,0,"odbc","ODBC Authen Error"
                         GO
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                         if exists (select * from sysobjects where id = object_id(`dbo.CSNTExtractUserClearTextPw')
                         and sysstat & 0xf = 4) drop procedure dbo.CSNTExtractUserClearTextPw
                         GO
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                         @username varchar(64)
                         AS
                         SET NOCOUNT ON
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                         FROM users
                         WHERE username = @username )
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                         GO
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                         if exists (select * from sysobjects where id = object_id(`dbo.CSNTFindUser') and
                         sysstat & 0xf = 4) drop procedure dbo.CSNTFindUser
                         GO
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                         @username varchar(64)
                         AS
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                         IF EXISTS( SELECT username
                         FROM users
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                         ELSE
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                         GO
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Reference:
http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_server_for_windows/4.0/user/guide/d.html#wp355420

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Dear Support,
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first thing first, I created new internal user on ACS, and trying to join the wireless network from my computer. I made it....
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Steps
11001 Received RADIUS Access-Request
11017 RADIUS created a new session
Evaluating Service Selection Policy
15004 Matched rule
15012 Selected Access Service - Default Network Access
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12500 Prepared EAP-Request proposing EAP-TLS with challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
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11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
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12318 Successfully negotiated PEAP version 0
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12805 Extracted TLS ClientHello message.
12806 Prepared TLS ServerHello message.
12807 Prepared TLS Certificate message.
12810 Prepared TLS ServerDone message.
12305 Prepared EAP-Request with another PEAP challenge
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11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
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12802 Prepared TLS Finished message.
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11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
12304 Extracted EAP-Response containing PEAP challenge-response
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11521 Prepared EAP-Request/Identity for inner EAP method
12305 Prepared EAP-Request with another PEAP challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
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11522 Extracted EAP-Response/Identity for inner EAP method
11806 Prepared EAP-Request for inner method proposing EAP-MSCHAP with challenge
12305 Prepared EAP-Request with another PEAP challenge
11006 Returned RADIUS Access-Challenge
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11018 RADIUS is re-using an existing session
12304 Extracted EAP-Response containing PEAP challenge-response
11808 Extracted EAP-Response containing EAP-MSCHAP challenge-response for inner method and accepting EAP-MSCHAP as negotiated
Evaluating Identity Policy
15006 Matched Default Rule
15013 Selected Identity Store -
22043 Current Identity Store does not support the authentication method; Skipping it.
24210 Looking up User in Internal Users IDStore - xxxxx
24216 The user is not found in the internal users identity store.
22016 Identity sequence completed iterating the IDStores
22056 Subject not found in the applicable identity store(s).
22058 The advanced option that is configured for an unknown user is used.
22061 The 'Reject' advanced option is configured in case of a failed authentication request.
11815 Inner EAP-MSCHAP authentication failed
11520 Prepared EAP-Failure for inner EAP method
22028 Authentication failed and the advanced options are ignored.
12305 Prepared EAP-Request with another PEAP challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
12304 Extracted EAP-Response containing PEAP challenge-response
12307 PEAP authentication failed
11504 Prepared EAP-Failure
11003 Returned RADIUS Access-Reject
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Steps
11001 Received RADIUS Access-Request
11017 RADIUS created a new session
11049 Settings of RADIUS default network will be used
Evaluating Service Selection Policy
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15012 Selected Access Service - Default Network Access
Evaluating Identity Policy
15006 Matched Default Rule
15013 Selected Identity Store - LDAPyyyy
24031 Sending request to primary LDAP server
24015 Authenticating user against LDAP Server
24022 User authentication succeeded
22037 Authentication Passed
22023 Proceed to attribute retrieval
22038 Skipping the next IDStore for attribute retrieval because it is the one we authenticated against
24210 Looking up User in Internal Users IDStore - xxxxx
24216 The user is not found in the internal users identity store.
22016 Identity sequence completed iterating the IDStores
Evaluating Group Mapping Policy
Evaluating Exception Authorization Policy
15042 No rule was matched
Evaluating Authorization Policy
15006 Matched Default Rule
15016 Selected Authorization Profile - Permit Access
11002 Returned RADIUS Access-Accept
I realized that Windows is using PEAP-MSCHAPv2 while Router is using PAP-ASCII as it's protocol.
so now, why PEAP-MSCHAPv2 can't authenticate to LDAP ?
is there anything I can do to make it work ?

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Hi,
I have a probleme with a Cisco Secure ACS 4.0 Solution Engine (CSACSE-1113-K9).
I try to power up the engine, but the light in the power button stay blinking all the time. Anyone have a idea why ?
Last week, I boot it for the first time (It's brand new), every things goes fine.
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No, I'm sur.
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Page 32(1-8) #2.
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Please close any applications...blabla.."
The thing is, I upgraded my backup ACS first and that upgrade worked like a charm.
In both cases, both for the primary and backup I do a remote takeover with Dameware, copied the ACS 4 folder to the hard drive of the server and do the upgrade from that folder.
As I said, the backup server upgrade worked without a hitch.
This is what I've tried:
1. I've verified that NO application is using the ACS 3.3 folder and no explorer window is open on that folder or subfolders.
I verified this by using a small program called Filemon.exe from Sysinternals. According to that program nothing was accessing said folder.
I also verified it again by actually renaming the ACS 3.3 folder after I shut down all the ACS services. I could not rename the folder if the services were started.
2. I've tried to stop the ACS services first and then do the setup, got the same error.
3. I disabled the antivirus software, got the same error.
I'm basically at my wits end now...
I have two options though:
1. Un-install ACS 3.3, do a clean install of ACS 4.0 and import the all data from the backup ACS.
Wouldn't that bring up the primary ACS with the backup ACS config? So I'm guessing I would need to go over it afterwards and do changes where appropriate ?
2. Do a backup of the ACS 3.3 with csutil -b
Uninstall ACS 3.3, do a clean install of ACS 4.0 and import all the data with csutil -r
Would that work? I've seen conflicting information here in this forum, some say it works, other say it doesn't.
I'm pretty much confused why this worked so well on the backup ACS but fails on the primary ACS.
Any help would be greatly appreciated!
Thanks!
Ivar Thorolfsson

Hi,
The folder lock message is often seen if the logs in the ACS directory are too big.
Move the Logs from the following Directories :-
CSAdmin\Logs
CSAuth\Logs
CSDBSync\Logs
CSLog\Logs
CSMon\Logs
CSRadius\Logs
CSTacacs\Logs
Logs
Then try to upgrade.
Regards,
Vivek

Cisco Secure ACS 4.2 for Windows web-based Admin Console log in problems

To Whomever Can Assist,
I am running two deployments of Cisco Secure ACS for Windows 4.2 and I can login into the admin web-console just fine. However, when I create a new or test user that mirror my configuration that user cannot login to the admin web-console. The user can login it to devices with the appropriate privileges, but can't administer his/her account within ACS. This has proven very problematic and needs a remedy. Thanks for the assistance.

Bradbryant.dhs,
Where are you creating the new admin user who should have access to ACS web gui under internal users or administration.
Internal user and ACS administrator accounts are completely different.
Adding administrator account
http://www.cisco.com/c/en/us/td/docs/net_mgmt/cisco_secure_access_control_server_for_windows/4-2/user/guide/ACS4_2UG/Admin.html
Regards,
Jatin Katyal
** Do rate helpful posts **

With Cisco Secure ACS 4.2 User accounts gets locked at first instance of wrong credentials even if configured for 3 attempts

Hello Everybody,
I am working with Cisco Secure ACS 4.2 and it is integrated with Active Directory at a Windows 2008 R2 functional level, user accounts that are set with lockout parameters (3 incorrect attempts) are locked out prematurely after the user enters the wrong credentials just once, the integration is done via LDAP.
I wonder if anybody has any idea why this is happening, because when I connect to a Cisco device or VPN, and type my password wrongly, on the Active Directory I get extra bad password counts.
Thanks in advance and regards....

Hello Scott,
Thanks for your answer. However we checked the ACS logs and it shows that we entered bad credentials just once, but in the Active Directory our account sometimes is blocked because we get at least 2 and sometimes 3 failures. This problem is only presented when we authenticate Cisco devices or through VPN, in normal circumstances, when users enter bad credentials on their computers, it works fine.
Thanks and regards...

Cisco Secure ACS wont' replicate

Hello Community,
I wonder if someone could please help me discover why we can't get our primary Cisco Secure ACS, UK-SU-AP091, to replicate with our secondary Cisco Secure ACS, UK-SU-AP092?
They can both talk to each other, but the replication status is stuck in pending. See attachment.
Any help will be greatly appreciated..
Cheers
Carlton

Well that's not your ONLY option. It's by far the best one. The primary server is attempting to communicate with the secondary and for whatever reason not succeeding.
If there is no reachability problem or firewall blocking the necessary ports in between then my first guess (95% + probability) would be that the services are not up on the secondary server.
If you cannot access the cli to check that, then you could do more obscure and less helpful checks like capture the traffic towards the secondary server from the local switch port where it connects to the network and examine for the incoming calls from the primary and the responses (if any) from the secondary. You could do a port scan (i.e. using nmap) on the secondary server and see if it responds to tcp/2000 (database replication) and/or tcp/49 and tcp/1812 (TACACS and RADIUS respectively).
After all of that and at the end of the day though, you're going to need to get into that secondary server. Not having local admin cli access is not a tenable long term situation to operate a production HA deployment.

Routing issue between Cisco Nexus and Cisco 4510 R+E Chassis

We have configured Cisco Nexus 7K9 as core and Cisco 4510 R+E as access switches for Server connectivity.
We are experiencing problem in terms of ARP learning and Ping issues between Cisco Nexus and end hosts.

Hi,
So you have N7k acting as L3 with servers connected to 4510?.
Do you see the MAC associated with failing ARP in 4510?. Is it happening with all or few servers?. Just to verify if it is connectivity issue between N7k and 4510, you can configure an SVI on 4510 and assign address from same raneg (server/core range) and perform a ping.
This will help narrow down if issue is between server to 4510 or 4510 to N7k.
Thanks,
Nagendra

Integration problem between Cisco Seure ACS 4.2 with LDAP

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