ACS 5.3 - Active Directory - limiter/DCs use to auth

Hi all

I have a Cisco ACS server deployed for GANYMEDE and RADIUS authentication for end-users.

Everything works fine, it is joined to the domain, most of the time people can auth. However, it seems that the ACS is trying to auth against * ANY * DC in my field.

DNS.findsrv FindSrvFromDns runs and draws from each domain controller to use. Not all of them are accessible or not fo all of them have the same structure of the user.

Is there a way to specify or limit/control which domain controllers are queried?

Hello

Unfortunately at this point there is no way to control which DC should be questioned by the AEC. The ACS will retrieve all the available DC on your AD domain name and contact one of them.

An enhancement request is already listed and developers are working to include the feature on future versions. Here is the information:

http://Tools.Cisco.com/support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCte92062

ACS should be able to query only the desired domain controllers

Symptom:
Currently in 5.0 and 5.1, the ACS queries the DNS with the field, in order to get a list of all the domain controllers in the domain and then try to communicate with each other. If the connection to even one domain controller fails, the connection of the CSA to the field is declared as failed. Many clients ask about this behavior change.
It should be possible to define which domain controllers to contact and/or make GBA to interpret the DNS resource records registered by the domain controller Active Directory to facilitate the location of domain controllers.  Active Directory uses the service locator, or SRV, records. A SRV record is a new record described in RFC 2782 DNS type and is used to identify the services located on a network of Transmission Control Protocol/Internet Protocol (TCP/IP). Conditionsof :
Domain with multiple domain controllers were some are not accessible from the security constraints given ACS / geographical. Workaround:
Make sure that all domain controllers are upward and accessible of the ACS.

Hope that clarifies it.

Kind regards.

Tags: Cisco Security

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