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QuickBooks Error 404 happens when the program is unable to establish a connection to a webpage or internet-based service, usually when updating or doing online operations. Incorrect network settings, out-of-date QuickBooks software, or connectivity problems can all be the cause of this message. First, make sure QuickBooks is up to date and check your internet connection. Next, modify antivirus and firewall settings to permit QuickBooks access. By selecting Help > Internet Options in QuickBooks, you may also reset your internet settings. Restarting your computer might help if the issue persists. QuickBooks support may be necessary for persistent problems.