diff --git a/ChangeLog b/ChangeLog
index e82ab45..e977ce7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,9 @@ Version 4.0.1.3 'Severard':
 	- Logfile reset on SIGHUP
 	(Gustavo Garcia suggestion).
 	- Log reset CLi command.
+	- Some error code corrections:
+	    * "Mobility forbidden" error changed, to value 405.
+	    * "Wrong credentials" situation is now treated as error 441.
 
 06/06/2014 Oleg Moskalenko <mom040267@gmail.com>
 Version 4.0.1.2 'Severard':
diff --git a/src/server/ns_turn_server.c b/src/server/ns_turn_server.c
index 0e1e491..657d02f 100644
--- a/src/server/ns_turn_server.c
+++ b/src/server/ns_turn_server.c
@@ -927,7 +927,7 @@ static int handle_turn_allocate(turn_turnserver *server,
 				break;
 			case STUN_ATTRIBUTE_MOBILITY_TICKET:
 				if(!(*(server->mobility))) {
-					*err_code = 501;
+					*err_code = 405;
 					*reason = (const u08bits *)"Mobility Forbidden";
 				} else if (stun_attr_get_len(sar) != 0) {
 					*err_code = 400;
@@ -1211,7 +1211,7 @@ static int handle_turn_refresh(turn_turnserver *server,
 			SKIP_ATTRIBUTES;
 			case STUN_ATTRIBUTE_MOBILITY_TICKET: {
 				if(!(*(server->mobility))) {
-					*err_code = 501;
+					*err_code = 405;
 					*reason = (const u08bits *)"Mobility forbidden";
 				} if(is_allocation_valid(a)) {
 					*err_code = 400;
@@ -3012,8 +3012,8 @@ static int check_stun_auth(turn_turnserver *server,
 
 	if(ss->username[0]) {
 		if(strcmp((char*)ss->username,(char*)usname)) {
-			*err_code = 401;
-			*reason = (const u08bits*)"Wrong username";
+			*err_code = 441;
+			*reason = (const u08bits*)"Wrong credentials";
 			return -1;
 		}
 	} else {