Fixing push notificaiton (#5394)

app/notification.go

@@ -535,7 +535,8 @@ func sendToPushProxy(msg model.PushNotification) *model.AppError {
 	msg.ServerId = utils.CfgDiagnosticId
 
 	tr := &http.Transport{
-		TLSClientConfig: &tls.Config{InsecureSkipVerify: *utils.Cfg.ServiceSettings.EnableInsecureOutgoingConnections},
+		TLSClientConfig:   &tls.Config{InsecureSkipVerify: *utils.Cfg.ServiceSettings.EnableInsecureOutgoingConnections},
+		DisableKeepAlives: true,
 	}
 	httpClient := &http.Client{Transport: tr}
 	request, _ := http.NewRequest("POST", *utils.Cfg.EmailSettings.PushNotificationServer+model.API_URL_SUFFIX_V1+"/send_push", strings.NewReader(msg.ToJson()))