You'd be prompted with Error 105 when your bank's website is down or having technical difficulties. Also, when your connected bank account is undergoing maintenance and server issues during the data transfer between QuickBooks.
Just to clarify, what is the name of the bank you're getting an error? This way I can further check its connectivity status.
In the meantime, you can follow the steps to get rid of the error:
Select the Banking menu.
Choose the appropriate account.
If you're still unable to connect, please wait 2 or 3 hours then try again.
Connectivity errors such as this usually fix itself within 24 hours.
Always feel free to leave a comment below if you have other questions about managing your connected bank accounts. I'm always here to help.
I keep receiving error code 105 and cannot sync my bank accounts
It's not easy to experience issue while doing a task in QuickBooks, heyitsjustme.
We've received similar reports from users not being able to update US bank account and seeing error 105. This has been worked on with our engineers of getting this resolved for you as quickly as possible. It would be best to reach out with our Customer Care Support Team to ensure your company details will be added to the notification list. That way, you'll receive an email whenever updates are available.
Here's how to contact them:
Click Help icon at the upper-right corner.
Click Contact us.
Enter "error 105" as your concern, then, click Let's talk.
You'll have the option on how you'll want to contact us.
In the meantime, I'm including these articles on how to manually upload transactions and categorize them in QuickBooks Online: