Windows XP 802.1x authentication fails after a reboot

I have XP SP3 installed on a workstation, configured to use 802.1x
authentication with a Cisco 3750 switch and a Microsoft NAP server providing
RADIUS services.

When I boot up the workstation, 802.1x authentication fails. If I unplug
the network cable from the workstation, then plug it back in, the workstation
immedately authenticates and grabs and IP address from DHCP.

If I reboot, authentication fails again until I unplug and replug the cable.
I can get the same result if I do a "shut/no shut" on the Cisco switch's
port.

Obviously, there's nothing actually wrong with 802.1x authentication, or
RADIUS or the switch. It's only when the workstation first boots up; I'm
guessing that while it's booting up, some service(s) are still coming up and
preventing authentication from working, but once the workstation has finished
booting, it is stuck in the switch's "failed authentication" vlan, and the
only way to restart the authentication process is to break the network
connection.

Since I'm going to deploy 802.1x to a couple of thousand workstations,
unplugging cables or reseting switch ports isn't a practical solution.

Does anyone know how to resolve this problem? Thanks.

On Mar 18, 3:26*pm, Troy Tripp <TroyTr...@discussions.microsoft.com>
wrote:
> I have XP SP3 installed on a workstation, configured to use 802.1x
> authentication with a Cisco 3750 switch and a Microsoft NAP server providing
> RADIUS services.
>
> When I boot up the workstation, 802.1x authentication fails. *If I unplug
> the network cable from the workstation, then plug it back in, the workstation
> immedately authenticates and grabs and IP address from DHCP.
>
> If I reboot, authentication fails again until I unplug and replug the cable.
> *I can get the same result if I do a "shut/no shut" on the Cisco switch's
> port.
>
> Obviously, there's nothing actually wrong with 802.1x authentication, or
> RADIUS or the switch. *It's only when the workstation first boots up; I'm
> guessing that while it's booting up, some service(s) are still coming up and
> preventing authentication from working, but once the workstation has finished
> booting, it is stuck in the switch's "failed authentication" vlan, and the
> only way to restart the authentication process is to break the network
> connection. *
>
> Since I'm going to deploy 802.1x to a couple of thousand workstations,
> unplugging cables or reseting switch ports isn't a practical solution.
>
> Does anyone know how to resolve this problem? *Thanks.

Hi Man,

Now I'm having the same problem in my lab environment!

Do you have any progress in this issue, if so please could you provide
me some tips?

Thanks a lot,

Rafael Bezerra

Has anybody found a solution for this problem? Apart from using a
different switch, I am facing the exact same problem, and google has so
far taught me nothing at all.


--
naantje
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