diff --git a/branches/2.0/doubango/tinyNET/src/ice/tnet_ice_ctx.c b/branches/2.0/doubango/tinyNET/src/ice/tnet_ice_ctx.c
index a72bfae4..23a62a43 100644
--- a/branches/2.0/doubango/tinyNET/src/ice/tnet_ice_ctx.c
+++ b/branches/2.0/doubango/tinyNET/src/ice/tnet_ice_ctx.c
@@ -2008,6 +2008,7 @@ static int _tnet_ice_ctx_fsm_ConnChecking_2_ConnCheckingCompleted_X_Success(va_l
 	const tnet_ice_pair_t *pair_offer, *pair_answer_src, *pair_answer_dest;
 	const tsk_list_item_t *item;
 	const tnet_ice_pair_t *pair;
+	const tnet_ice_candidate_t *candidate;
 	tsk_list_t* sessions = tsk_list_create(); // for lock-free TURN sessions destroying
 	int ret;
 
@@ -2048,7 +2049,7 @@ static int _tnet_ice_ctx_fsm_ConnChecking_2_ConnCheckingCompleted_X_Success(va_l
 	}
 	if (ret == 0 && pair_offer) ((tnet_ice_pair_t *)pair_offer)->is_nominated = tsk_true;
 
-	// collect all useless TURN sessions (lock-free)
+	// collect all useless TURN sessions (pairs)
 	tsk_list_foreach(item, self->candidates_pairs) {
 		if (!(pair = item->data) || !pair->candidate_offer || !pair->candidate_offer->turn.ss) {
 			continue;
@@ -2061,6 +2062,32 @@ static int _tnet_ice_ctx_fsm_ConnChecking_2_ConnCheckingCompleted_X_Success(va_l
 
 	tsk_list_unlock(self->candidates_pairs);
 
+	// collect all useless TURN sessions (local candidates)
+	tsk_list_lock(self->candidates_local);
+	tsk_list_foreach(item, self->candidates_local) {
+		if (!(candidate = item->data) || !candidate->turn.ss) {
+			continue;
+		}
+		if (candidate->turn.ss != self->turn.ss_nominated_rtp && candidate->turn.ss != self->turn.ss_nominated_rtcp) {
+			tsk_list_push_back_data(sessions, (void**)&candidate->turn.ss);
+			TSK_OBJECT_SAFE_FREE(((tnet_ice_candidate_t*)candidate)->turn.ss);
+		}
+	}
+	tsk_list_unlock(self->candidates_local);
+
+	// collect all useless TURN sessions (remote candidates)
+	tsk_list_lock(self->candidates_remote);
+	tsk_list_foreach(item, self->candidates_remote) {
+		if (!(candidate = item->data) || !candidate->turn.ss) {
+			continue;
+		}
+		if (candidate->turn.ss != self->turn.ss_nominated_rtp && candidate->turn.ss != self->turn.ss_nominated_rtcp) {
+			tsk_list_push_back_data(sessions, (void**)&candidate->turn.ss);
+			TSK_OBJECT_SAFE_FREE(((tnet_ice_candidate_t*)candidate)->turn.ss);
+		}
+	}
+	tsk_list_unlock(self->candidates_remote);
+
 	// lock-free destruction
 	TSK_OBJECT_SAFE_FREE(sessions);
 
diff --git a/branches/2.0/doubango/tinyNET/src/turn/tnet_turn_session.c b/branches/2.0/doubango/tinyNET/src/turn/tnet_turn_session.c
index 93784408..aa12347e 100644
--- a/branches/2.0/doubango/tinyNET/src/turn/tnet_turn_session.c
+++ b/branches/2.0/doubango/tinyNET/src/turn/tnet_turn_session.c
@@ -1315,6 +1315,15 @@ static int _tnet_turn_session_send_refresh(tnet_turn_session_t* p_self)
 	}
 	// add authentication info
 	tnet_stun_pkt_auth_copy(p_self->p_pkt_refresh, p_self->cred.p_usr_name, p_self->cred.p_pwd, p_self->p_pkt_alloc);
+#if 0
+	if (p_self->u_lifetime_alloc_in_sec == 0) {
+		const tnet_stun_attr_vdata_t *pc_attr_nonce = tsk_null;
+		tnet_stun_pkt_attr_find_first(p_self->p_pkt_refresh, tnet_stun_attr_type_nonce, (const tnet_stun_attr_t**)&pc_attr_nonce);
+		if (pc_attr_nonce) {
+			pc_attr_nonce->p_data_ptr[0] = 'a';
+		}
+	}
+#endif
 	// add attributes
 	ret = tnet_stun_pkt_attrs_add(p_self->p_pkt_refresh,
 		TNET_STUN_PKT_ATTR_ADD_LIFETIME(p_self->u_lifetime_alloc_in_sec),