The QuickBooks Desktop users often face problems in QuickBooks firewall ports, once they are in multi-user mode.
In case your firewall blocks Internet access required for specific QuickBooks programs or files, you're likely to encounter errors. once you update your firewall to its latest version, likelihood is that that you simply will fix this issue otherwise you could also be required to configure your firewall software. you'll need to add exceptions for QuickBooks firewall ports.
