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Can anyone here please share some thoughts and comments of when to use Azure WAF or Azure Firewall. I have already existing Azure ExpressRoute so my Azure VMs can ping my OnPremise servers, and vice versa.

My purpose here is to be able to securely publish Azure Web Application & API that is accessing the database on my OnPremise SQL server.

Senior Systems Engineer
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Application gateway provides a WAF for inbound connections only for HTTP/S traffic (OWASP rules and more), Azure Firewall provides both inbound and outbound filtering also for non-HTTP traffic (E.G. your VMs can only go out to FQDN X, Y on port Z, K. and block other traffic).

Stefano d'Antonio
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