Well, you can quickly fix QuickBooks error 12029, which happens due to internet connection error or firewall blocking the QB desktop operations. For primary diagnosis, you need to update your windows and QB desktop to the latest version and check the internet connectivity. Also, upgrade the internet explorer browser as per the new release. You can turn off the firewall temporarily and configure it to allow the QuickBooks operations. If the problem persists, then go to the internet setting and then visit SSL settings, now enable the TLS 1.2. Now reboot your computer and check if the QuickBooks error 61 is resolved.