diff --git a/coreapi/callbacks.c b/coreapi/callbacks.c
index 100373f68..7c8533759 100644
--- a/coreapi/callbacks.c
+++ b/coreapi/callbacks.c
@@ -24,6 +24,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #include "private.h"
 #include "mediastreamer2/mediastream.h"
 
+static void register_failure(SalOp *op, SalError error, SalReason reason, const char *details);
 
 static void linphone_connect_incoming(LinphoneCore *lc, LinphoneCall *call){
 	if (lc->ringstream!=NULL){
@@ -428,6 +429,9 @@ static void auth_requested(SalOp *h, const char *realm, const char *username){
 		sal_op_authenticate(h,&sai);
 		ai->usecount++;
 	}else{
+		if (ai && ai->works==FALSE) {
+			register_failure(h, SalErrorFailure, SalReasonForbidden, _("Authentication failure"));
+		} 
 		if (lc->vtable.auth_info_requested)
 			lc->vtable.auth_info_requested(lc,realm,username);
 	}
@@ -448,6 +452,7 @@ static void register_success(SalOp *op, bool_t registered){
 	char *msg;
 	
 	cfg->registered=registered;
+	linphone_proxy_config_set_error(cfg,LinphoneErrorNone);
 	linphone_proxy_config_set_state(cfg, registered ? LinphoneRegistrationOk : LinphoneRegistrationCleared ,
 	                                registered ? "Registration sucessful" : "Unregistration done");
 	if (lc->vtable.display_status){
@@ -475,6 +480,11 @@ static void register_failure(SalOp *op, SalError error, SalReason reason, const
 		lc->vtable.display_status(lc,msg);
 		ms_free(msg);
 	}
+	if (error== SalErrorFailure && reason == SalReasonForbidden) {
+		linphone_proxy_config_set_error(cfg, LinphoneErrorBadCredentials);
+	} else if (error == SalErrorNoResponse) {
+		linphone_proxy_config_set_error(cfg, LinphoneErrorNoResponse);
+	}
 	linphone_proxy_config_set_state(cfg,LinphoneRegistrationFailed,details);
 }
 
diff --git a/coreapi/private.h b/coreapi/private.h
index a53e3d4bf..eb5a26c88 100644
--- a/coreapi/private.h
+++ b/coreapi/private.h
@@ -196,7 +196,7 @@ void linphone_core_stop_waiting(LinphoneCore *lc);
 int linphone_core_start_invite(LinphoneCore *lc, LinphoneCall *call, LinphoneProxyConfig *dest_proxy);
 void linphone_core_start_pending_refered_calls(LinphoneCore *lc);
 extern SalCallbacks linphone_sal_callbacks;
-
+void linphone_proxy_config_set_error(LinphoneProxyConfig *cfg,LinphoneError error);
 
 struct _LinphoneProxyConfig
 {
@@ -220,6 +220,7 @@ struct _LinphoneProxyConfig
 	bool_t dial_escape_plus;
 	void* user_data;
 	time_t deletion_date;
+	LinphoneError error;
 };
 
 struct _LinphoneAuthInfo 
diff --git a/coreapi/proxy.c b/coreapi/proxy.c
index 251bdbb13..07a8e6c81 100644
--- a/coreapi/proxy.c
+++ b/coreapi/proxy.c
@@ -829,5 +829,11 @@ LinphoneRegistrationState linphone_proxy_config_get_state(const LinphoneProxyCon
 	 }
 	 return NULL;
  }
+LinphoneError linphone_proxy_config_get_error(const LinphoneProxyConfig *cfg) {
+	return cfg->error;
+}
+void linphone_proxy_config_set_error(LinphoneProxyConfig *cfg,LinphoneError error) {
+	cfg->error = error;
+}