Networking
Move from DNS to application in layers and avoid risky network changes.
Layer-by-layer model
DNS
→IP
→Routing
→Firewall
→Port
→IIS
→Application
Commands
ipconfig /all
nslookup example.com
Test-NetConnection example.com -Port 443
Test-NetConnection SERVER-IP -Port 3389The website works on the server itself but not from the Internet. Where do you look?
Public DNS, firewall, ports 80/443, Cloudflare/proxy/NAT/routing and IIS bindings.
Production rule: preserve the current management path. Do not flush/reset firewall rules and accidentally lock yourself out.