I have an internal web server that I can access from the internal network with no problems, but am getting a request timeout from outside of the network.
I have a DNAT rule set up to allow connections from a handful of IP addresses from HTTP service and forward them to the web server.
I can see that the traffic is getting through the UTM (reviewing the Firewall log) and being directed to the web server, but I still get a timeout error.
I have turned off the firewall on the web server (Win 2016 running IIS).
Wireshark on the web server reveals that the packets reach the web server, but then go into a re-transmission loop.
Can anyone shed some light on what's happening?
Thanks, SO MUCH!
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