Cisco WLC with 802.1x and LDAP authentication

Hi,

I was trying to configure a Cisco 2504 WLC with user-logins via 802.1x. The authentication is supposed go through our central LDAP server, allowing us to use the same user/pw for connection to the WLAN.
After countless hours, I'm wondering if this even possible, even though the Security->AAA-Servers tab allows one to select up to three LDAP servers. With only LDAP selected, I get this in the debugs when I try to connect to the AP:

Returning AAA Error 'No Server' (-7) for mobile [..]

If I have radius enabled, request packets are correctly generated and sent by the controller.

I tried switching to Web-auth, again using LDAP for authentication, which resulted in a web login being displayed in the browser once the WLAN connection is up. The web auth correctly accepted my user/pw combo from the LDAP servers ... so I assume the LDAP configuration is correct.

What am I missing here? Are there any limitations in the 802.1x-authentication I am not aware of? Given the broad use of LDAP based authentication (e.g. in ADS), I would wonder that user/pw auth is not available at this point, but rather just Radius ... even in the Cisco docs I was only able to find samples on how to configure 802.1x with Radius  ...

Please let me know what additional information is needed for diagnose ...

P.S. - tried with 7.4/7.5/7.6 OS version of the WLC, LDAP is a stock LDAP server on a Linux machine

Thanks!
LVL 18
Garry GlendownConsulting and Network/Security SpecialistAsked:
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Craig BeckConnect With a Mentor Commented:
LDAP-based authentication only supports 'some' 802.1x protocols unless you're lucky.  We generally advise against using LDAP unless you absolutely have to.

https://supportforums.cisco.com/thread/2214399

The main point here is this:

LEAP, EAP-FAST/MSCHAPv2, and PEAPv0/MSCHAPv2 are also supported,
but only if the LDAP server is set up to return a clear-text password. For example, Microsoft Active Directory is not supported because it does not return a clear-text password. If the LDAP server cannot be configured to return a clear-text password, LEAP, EAP-FAST/MSCHAPv2, and PEAPv0/MSCHAPv2 are not supported.
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