I keep getting this message when I try to connect to my bank. Looks like the connection to *insert bank name* isn’t available right now. Try again in a few hours. (4000)

Try opening your QBO account on any private/incognito browser.

Thank you for reaching out to the Community, Tippy23. Let's work together to get this sorted out quickly. Before we begin, can we have the name of your financial institution? So we could look into our records for any ongoing investigations about this particular issue.

While waiting for your response, kindly log in to your bank's website to check ongoing maintenance. If there's no issue on your bank's end, log in to your QuickBooks Online (QBO) account with a different browser and see if it works. If nothing happens, let's go ahead and do a few things to fix any problematic cache on your browser that may prevent a successful connection with your bank and QBO:

1. Restart your browser.

2. Clear your browser's cache.

3. Add Intuit as a trusted site.

Moreover, you can manually upload your bank transactions if you have copies available. You can follow this article: How to upload transactions manually in QuickBooks Online.

Should you have any further questions regarding bank connections, feel free to comment down below.