diff --git a/src/radius/radius_client.c b/src/radius/radius_client.c
index 1382c53..34f5685 100644
--- a/src/radius/radius_client.c
+++ b/src/radius/radius_client.c
@@ -658,7 +658,8 @@
 	}
 
 	if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) {
-		if (conf->acct_server == NULL || radius->acct_sock < 0) {
+		if (conf->acct_server == NULL || radius->acct_sock < 0 ||
+		    conf->acct_server->shared_secret == NULL) {
 			hostapd_logger(radius->ctx, NULL,
 				       HOSTAPD_MODULE_RADIUS,
 				       HOSTAPD_LEVEL_INFO,
@@ -672,7 +673,8 @@
 		s = radius->acct_sock;
 		conf->acct_server->requests++;
 	} else {
-		if (conf->auth_server == NULL || radius->auth_sock < 0) {
+		if (conf->auth_server == NULL || radius->auth_sock < 0 ||
+		    conf->auth_server->shared_secret == NULL) {
 			hostapd_logger(radius->ctx, NULL,
 				       HOSTAPD_MODULE_RADIUS,
 				       HOSTAPD_LEVEL_INFO,
diff --git a/src/radius/radius_das.c b/src/radius/radius_das.c
index 9655f4c..39ceea8 100644
--- a/src/radius/radius_das.c
+++ b/src/radius/radius_das.c
@@ -42,6 +42,7 @@
 		RADIUS_ATTR_CALLING_STATION_ID,
 		RADIUS_ATTR_NAS_IDENTIFIER,
 		RADIUS_ATTR_ACCT_SESSION_ID,
+		RADIUS_ATTR_ACCT_MULTI_SESSION_ID,
 		RADIUS_ATTR_EVENT_TIMESTAMP,
 		RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
 		RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
@@ -129,6 +130,12 @@
 		attrs.acct_session_id_len = len;
 	}
 
+	if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_ACCT_MULTI_SESSION_ID,
+				    &buf, &len, NULL) == 0) {
+		attrs.acct_multi_session_id = buf;
+		attrs.acct_multi_session_id_len = len;
+	}
+
 	if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
 				    &buf, &len, NULL) == 0) {
 		attrs.cui = buf;
@@ -147,6 +154,12 @@
 			   "%s:%d", abuf, from_port);
 		error = 503;
 		break;
+	case RADIUS_DAS_MULTI_SESSION_MATCH:
+		wpa_printf(MSG_INFO,
+			   "DAS: Multiple sessions match for request from %s:%d",
+			   abuf, from_port);
+		error = 508;
+		break;
 	case RADIUS_DAS_SUCCESS:
 		error = 0;
 		break;
diff --git a/src/radius/radius_das.h b/src/radius/radius_das.h
index e3ed540..ce731d4 100644
--- a/src/radius/radius_das.h
+++ b/src/radius/radius_das.h
@@ -14,7 +14,8 @@
 enum radius_das_res {
 	RADIUS_DAS_SUCCESS,
 	RADIUS_DAS_NAS_MISMATCH,
-	RADIUS_DAS_SESSION_NOT_FOUND
+	RADIUS_DAS_SESSION_NOT_FOUND,
+	RADIUS_DAS_MULTI_SESSION_MATCH,
 };
 
 struct radius_das_attrs {
@@ -30,6 +31,8 @@
 	size_t user_name_len;
 	const u8 *acct_session_id;
 	size_t acct_session_id_len;
+	const u8 *acct_multi_session_id;
+	size_t acct_multi_session_id_len;
 	const u8 *cui;
 	size_t cui_len;
 };