Problem between HP AP420 and MSM410

[NunoBarros]

Hi,

In our enterprise, i have installed 50 aps (Hp Procurve AP420) in many places, but this Access Points only broadcast one SSID, and i have to substitute one of this for one HP Procurve MSM410 which broadcast more than one SSID.

And is here that i have the problem.

One of the SSID's is configured with RADIUS authentication and WPA+WP2 security type.
In Ap420 when the connection is made the security type is WPA2-Enterprise and the encryption type is TKIP, but in MSM410 the security type still WPA2-Enterprise and the encryption type is AES witch don´t permite to roaming between the acess points.

As far i know there is no configuration method to force the TKIP or the AES encryption type

Note: we have more than one thousand computers configured with TKIP

Is any chance that i configure the MSM410 with WPA2 - TKIP ?

Thanks in advance.