diff -ur madwifi-0.9.2.orig/net80211/ieee80211_wireless.c madwifi-0.9.2/net80211/ieee80211_wireless.c
--- madwifi-0.9.2.orig/net80211/ieee80211_wireless.c	2006-07-06 06:23:08.000000000 +0300
+++ madwifi-0.9.2/net80211/ieee80211_wireless.c	2006-07-28 00:05:18.000000000 +0300
@@ -307,6 +307,14 @@
 			else
 				vap->iv_flags &= ~IEEE80211_F_DROPUNENC;
 		}	
+                /*
+                 * Update the authentication mode
+                 */
+                if (vap->iv_flags & IEEE80211_F_PRIVACY)
+                    vap->iv_bss->ni_authmode = IEEE80211_AUTH_SHARED;
+                else
+                    vap->iv_bss->ni_authmode = IEEE80211_AUTH_OPEN;
+
 	}
 	if (error == 0 && IS_UP(vap->iv_dev)) {
 		/*