Multiple solutions can be used depending on the cause of QuickBooks Error Code 12029. If you are able to identify the reason, here are some solutions you pick from. And if not, simply contact an expert.

• Try to check whether a virus or malware is hindering your connection.

• Ensure that the connectivity of the internet is not the problem. 

• Also, check the settings of antivirus and firewall and make sure that Quickbooks is allowed in them.

• Install all the recent updates of Quickbooks and the security certificate as well

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