There are many technical things involved when it comes to connecting with the server, and the failure of even one can trigger quickbooks error 12029. It can be because of technical reasons, such as the wrong configuration in windows, or even external reasons, such as poor internet connection. 

Some other reasons also lead to this error, such as downloading is unable to complete due to Windows Firewall settings or any third-party application. As a result, your SSL settings are wrong, and Internet Explorer is not your default Browser.

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