diff --git a/entrypoint.sh b/entrypoint.sh
index 1158270..5dd234a 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -70,6 +70,15 @@ if [ ! -z "$SOURCE" ]; then
 	for i in $(echo $SOURCE) ; do
 		name_resolver $i;
 		debug "source ip is $APP_IP";
+			if [[ -z "$APP_IP" ]]; then
+				debug "No any IP address found for SOURCE: $SOURCE, try again to resolv";
+				name_resolver $i;
+				debug "source ip is $APP_IP";
+				
+				if [[ -z "$APP_IP" ]]; then
+					debug "No any IP address found for SOURCE: $SOURCE, giving up";
+				fi
+			fi
 		SOURCE_IP=$APP_IP;
 	done
 
@@ -80,6 +89,15 @@ for i in $(echo $TARGET) ; do
 	
        name_resolver $i;
        debug "target ip is $APP_IP";
+		if [[ -z "$APP_IP" ]]; then
+			debug "No any IP address found for TARGET: $TARGET, try again to resolv";
+			name_resolver $i;
+			debug "Target ip is $APP_IP";
+			
+			if [[ -z "$APP_IP" ]]; then
+				debug "No any IP address found for TARGET: $TARGET, giving up";
+			fi
+		fi
        for IP in $(echo $APP_IP); do
 		IDX=$(expr 1 + $IDX)
 		eval TARGET_IP_$IDX=$IP;