Besides the internet and the Bungie servers, what else could cause the CAT error?

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Grade: Education Subject: Support
Besides the internet and the Bungie servers, what else could cause the CAT error?
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Software firewalls (like Windows Firewall or third-party antivirus software) can sometimes interfere with Destiny 2's network communication, leading to 'CAT' errors. Ensure Destiny 2 is added to the allowed applications list. Sometimes, a problematic VPN can also cause issues; try disabling it.