Hey there, @EMaher.
 
Here are some of the possible reasons why you're last connection attempt failed:

• There’s a problem with your bank
• There’s a problem with your Internet connection
• There’s a problem with one or more bank accounts in your company file
• You’re using an outdated version of Internet Explorer

First off, make sure to back up your company file to save everything currently in your file. Also, ensure you’re using a supported version of QuickBooks. Otherwise, update QuickBooks to the latest release.

Once done, let's perform basic troubleshooting to fix the problem. We'll have to check your internet security requirements, which Quickbooks uses the TLS 1.2 security protocol, to secure data when connecting to your bank. 

Here's how:

1. Open Internet Explorer.
2. Go to Tools ⚙.
3. Select Internet options.
4. Select Advanced, and scroll down to the Security section.
5. See if you have TLS 1.2 checked. If not, select the box to turn it on.
6. Select OK.
7. Exit all open applications on your computer.
8. Restart your computer, then try to download your transactions.

If you still get the error, take a look at this article and proceed to Step 2: Download bank feed transactions in a test company file.

If you need further assistance, let us know in the comment section. We're always here to help. Have a great day.