Azure – External access to port 8080 is not working (Windows Server 2012 VM in Azure)

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The page is served on port 8080. It works locally (http://localhost:8080). (Also tried port 80, no avail.)

I have already disabled the firewall.

I have already configured the inbound rule of the security group in Azure, this way:
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Error is:

$ telnet 13.76.139.111 8080
Trying 13.76.139.111...
telnet: Unable to connect to remote host: Connection timed out

Best Answer

As answered here, make sure to set the source port range as *. Clients use a source port number allocated from a pool of ephemeral ports.

(Also explained in a comment from Ralph Squillace replying feedback over an article about how to do it in a classic VM.)