I have solved the issue. I add my comment for anyone who may have the same problem. What I found in MYOB are:
1. If the user is a new user in data file, I need to reset the password (Click on the link I forgot password), the first password always has a problem.
2. I double check between my computer and the new computer, this is what I have ticked and unticked.
3. My problem happened in Easter time, I feel the something happened in the firewall, so if you enter wrong username and password, there is no message. Instead of that, it just says Unable to connect.
Hi hdexpertise - thank you for posting your solution for the community and great work on solving this.
The TLS settings do affect the ability to communicate with the server and they are a great place to check if you are unable to connect.
