QuickBooks Error 15240 can be brought on by antivirus or firewall software, yes. These security tools run the risk of blocking or interfering with the connections that QuickBooks needs to work properly, including accessing the internet for updates. The error may occur because antivirus software flags some QuickBooks files as potentially malicious and prevents users from accessing or modifying them. The necessary connections between servers and QuickBooks might also be prevented by strong firewall settings. Under the right circumstances, temporarily turning off or changing the firewall or antivirus settings can frequently assist in fixing QuickBooks Error 15240.

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