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ACS AAA 802.1x authentication

I am trying to authenticate a Windows XP client when physically connecting to a 2948G Switch.

I've configured all parts to work toguether. But when the switch tries to authenticate the user (MD5 or TLS) always appears a log entry in the ACS failed authentications log that says "Auth type not supported by external DB"

External DB is a W2K domain. It does successly authenticates RAS users through ACS, but not 802.1x.I have had problems to install a CA certificare (it seems to enroll the certificare, but the CA does not appear in the list to check it).

Any ideas?


Re: ACS AAA 802.1x authentication

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.