Most of the time, connection issues in QuickBooks Online are caused by the accumulated cache in the browser. To rule this out, you can try accessing your QuickBooks Online account using a private window. This mode doesn't save browsing history, cookies, and site data. Here are the shortcut keys:
Ctrl + Shift + N for Google Chrome
Ctrl + Shift + P for Firefox & Microsoft Edge
Command + Shift + N for Safari
If you're now able to connect, go back to your regular browser. Next, clear its cache and cookies to delete the stored junk and start over fresh. You may also switch to other supported browsers to further isolate the issue.
For additional tips and resources while working with your taxes in the program, you browse a topic on this page: Manage taxes in QuickBooks.
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