Usually caused by improper login credentials, server problems, or interference from security software, QuickBooks Error 179 happens when the program is unable to connect to your bank account. Incorrect login passwords, bank server outages, out-of-date QuickBooks versions, and excessively restrictive firewalls or antivirus software are common reasons. Double-check your login information, make sure the server at your bank is up and running, update QuickBooks, and temporarily turn off security software to resolve this issue.