There maybe multiple reasons why your account cannot connect. Please make sure you are doing the following: 1. You are connecting with your TRADING password not your INVESTOR account. 2. You're entering the wrong server, account number or password. 3. You are a Signal account and you need to close all trades from an exisitig account you had connected. 4. You're MT4 password is too long - it needs to be less than 15 characters.