There are multiple things that can cause this issue and you will have to diagnose it properly. If you are unable to do it; let an expert help. Otherwise, you can pick these below given solutions one by one. And this will help you in getting rid of the QuickBooks Not Updatingproblem.

• First thing you should check whether the time and date on your system is correctly placed or not. If there is any mismatch; you must correct it.

• Then this problem can be caused due to incorrect internet connection settings. 

• Check whether the security application or firewall are casuing this issue or not.