After upgrading to Sequoia, ESET software can inform users it's unsupported and also cause network connectivity trouble. The issue seems to be tied to network filters configured in macOS that must be removed before the software will work. If users don't do that job, the software must be removed and reinstalled.
Both Microsoft and ESET have posted bulletins about networking problems in macOS 15, and both report different fixes for their respective problems as well.
This was reported to Apple before [Sequoia] released (by multiple people, to multiple teams/orgs within Apple) so Apple 100% knew about this, and shipped macOS 15 anyways.
According to Microsoft, its issue has to do with macOS's Stealth Mode, which stops a machine from responding to ping requests or connection requests from closed TCP or UDP networks. Stealth Mode has to be disabled in Firewall settings to resolve the issue.
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