QuickBooks Error OL -334 means that there is an issue with the user’s bank that they might have rolled out some of the improvements to their offerings related to the administration, Web Connector the Direct Connect.
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Ensure that there is the latest version of Internet Explorer, where you can use the following steps to enable TLS 1.2.
If the same error message continues, only then, proceed to Step 2.
This step helps if the issue originates from the bank and the bank servers.
If the above steps did not seem to solve the issue, there is an alternative to contact the bank. However, the user can also get in touch with the QuickBooks support team in order to get this sorted for once and all.