I would like to know that too. Ran across this today.

RADIUS works on these switches.  Please post your config and we will get you going.

Thank you for your reply.

I finally realized that I removed LOCAL has a method for HTTP authentication method. That was why my account was not properly authenticated.

Please post your current configuration from the 6224 (and 6024F if different) and a quick steps-to-reproduce and I will try it on my setup and then give feedback.  

I'm having this same issue with NPS (Windows 2008 Network Policy Server). I am passing "shell:priv-lvl=15" in the AV pair. For HTTP and HTTPS access, this works great. But for SSH and telnet access, I still have to type enable to get to enable mode. There doesn't seem to be any debug tools related to this so it's VERY difficult to troubleshoot. The exact same settings work great for our 5224 and 5136M switches. Let me know what config you need (switch or NPS) and I'll post it.

It looks like the same thing happens for me with TACACS.  I have:

        service = exec {
                priv-lvl = 15
        }

...which works fine under 53xx and 54xx, but does not enable me automatically under 62xx.

Hello,

I have a PowerConnect 6248 and is able to authenticate it with the windows 2008 NPS (RADIUS Authentication), now I can login to the http console using my domain userid, but it is in read only mode, and cannot do any administrative operations from web console.

I have followed : http://www.dell.com/downloads/global/products/pwcnt/en/3424_radius_auth_using_msserver.pdf and http://youritguy.wordpress.com/2009/10/02/aaa-radius-authentication-with-windows-server-2008/ but nothing helps. Still I am only able to login as read only mode. It is nice to know that you have a working configuration for NPS, I request you to share the configuration with me too.

Thanks in Advance

Achus