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ACS Express, Radius with AD

I've installed a Cisco Secure ACS Express as a radius server for all of my switches/routers so that I can use Active Directory as user database.

I've configured the switches/routers and Cisco Secure ACS Express but when I try and authenicate I recieve a failure.

I've checked the logs on both the Cisco Secure ACS Express and the Domain Controllers and I get the following error on the DC

Event ID 675

Pre-Authentication Type: 0x2

Failure Code: 0x18

Error on ACS

acsxp/server Warning Server 0 Authentication for user jbloggs failed for reason = 0

acsxp/server Error Protocol request from 192.0.0.1: User jbloggs rejected by RemoteServer: AD (Invalid Password)

I've looked up this error and it suggests bad password, but i've used multiple accounts and it still gives me the same error. The AD had been hardened to CIS benchmarks.

Any help would be appreciated.

Daniel

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