Merge pull request #3234 from kefoster951/fix_redis_auth

Fix redis authentication reattempt issue

server/util-server.js

@@ -413,12 +413,18 @@ exports.radius = function (
 exports.redisPingAsync = function (dsn) {
     return new Promise((resolve, reject) => {
         const client = redis.createClient({
-            url: dsn,
+            url: dsn
         });
         client.on("error", (err) => {
+            if (client.isOpen) {
+                client.disconnect();
+            }
             reject(err);
         });
         client.connect().then(() => {
+            if (!client.isOpen) {
+                client.emit("error", new Error("connection isn't open"));
+            }
             client.ping().then((res, err) => {
                 if (client.isOpen) {
                     client.disconnect();
@@ -428,7 +434,7 @@ exports.redisPingAsync = function (dsn) {
                 } else {
                     resolve(res);
                 }
-            });
+            }).catch(error => reject(error));
         });
     });
 };