LEAP and not broadcasted ESSID - problem??

[Bc. Michal Semler]

Hi,

I need to connect to CISCO LEAP AP - Cisco 1100. Admin gave me my 
login/password and AP is configured to use dynamical WEP. Username/password 
are handled via RADIUS. AP hides it's ESSID.

I wasn't successfull. Can you tell me wheres problem?

My card is hostap_cs - hostap0.2.4
wpa_supplicant 0.2.4

hostap_cs: 0.2.4 - 2004-07-17 (Jouni Malinen <jkmaline at cc.hut.fi>)
hostap_cs: setting Vcc=33 (constant)
hostap_cs: CS_EVENT_CARD_INSERTION
hostap_cs: setting Vcc=50 (from config)
Checking CFTABLE_ENTRY 0x01 (default 0x01)
IO window settings: cfg->io.nwin=1 dflt.io.nwin=1
io->flags = 0x0046, io.base=0x0000, len=64
hostap_cs: Registered netdevice wifi0
hostap_cs: index 0x01: Vcc 5.0, irq 10, io 0x0100-0x013f
wifi0: NIC: id=0x800c v1.0.0
wifi0: PRI: id=0x15 v1.1.1
wifi0: STA: id=0x1f v1.8.0
wifi0: registered netdevice wlan0
---
wpa_supplicant:
.config:
CONFIG_DRIVER_HOSTAP=y
CONFIG_DRIVER_WEXT=y
CONFIG_WIRELESS_EXTENSION=y
CONFIG_IEEE8021X_EAPOL=y
CONFIG_EAP_MD5=y
CONFIG_MSCHAPV2=y
CONFIG_EAP_TLS=y
CONFIG_EAP_PEAP=y
CONFIG_EAP_TTLS=y
CONFIG_EAP_GTC=y
CONFIG_EAP_OTP=y
CONFIG_EAP_LEAP=y

conf:
# LEAP with dynamic WEP keys
network={
    ssid="CVUT-13136-EAP"
    key_mgmt=IEEE8021X
    eap=LEAP
    scan_ssid=1
    identity="username"
    password="pass"
}

Then I call wpa_supplicant and gets this error:

Starting AP scan (specific SSID)
Scan SSID - hexdump_ascii(len=14):
     43 56 55 54 2d 31 33 31 33 36 2d 45 41 50         CVUT-13136-EAP
ioctl[PRISM2_IOCTL_HOSTAPD]: Operation not supported
Failed to initiate AP scan.

That's probably that problem....how can I fix it? For test purposes I run 
wpa_supplicant as root

Thanks a lot!

Michal