WAMPServer Connection Error Check the system tray and ensure that WAMPServer is running and is green. If so, double-click the local instance wampmysqld64. If it is working properly, MySQLWorkbench will open as shown below: If there is an error while opening the local instance, right click on the instance and select Delete Connection... or Delete All Connections... if there are more than one. Right click on the + symbol beside MySQL Connections and select Rescan for Local MySQL Instances. Select OK on the pop-up window, then double click on the new instance. It should open like below: