The Windows Firewall and Business Applications — Register Inbound Rules From the Installer (archived 2026-08-30)

Abstract

"It works on the dev machine but the client can't connect" almost always traces back to the Windows Firewall. This article covers the default-block-inbound behaviour and profiles, why you cannot leave production to the security warning dialog, and how to register inbound rules from the installer and triage connection failures. Archived version of https://comcomponent.com/en/blog/windows-firewall-business-apps/, as published on 2026-08-30. The live article is maintained and may change after this date. First published 2026-08-01.